diff --git a/src/unit_tests/unit_test_main.cc b/src/unit_tests/unit_test_main.cc
index 5c71f874b..4b85cbc27 100644
--- a/src/unit_tests/unit_test_main.cc
+++ b/src/unit_tests/unit_test_main.cc
@@ -43,6 +43,7 @@
 #if defined(HAVE_QT)
 
 #  include "layApplication.h"
+#  include "layMainWindow.h"
 #  include "laySystemPaths.h"
 #  include "layVersion.h"
 
@@ -87,6 +88,13 @@ main (int argc, char **argv)
 static bool
 run_test (tl::TestBase *t, bool editable, bool slow, int repeat)
 {
+#if defined(HAVE_QT)
+  //  provide a clean main window without any views attached
+  if (lay::MainWindow::instance ()) {
+    lay::MainWindow::instance ()->close_all ();
+  }
+#endif
+
   for (int i = 0; i < repeat; ++i) {
     if (repeat > 1) {
       ut::noctrl << "Repeat iteration " << i + 1 << " of " << repeat;
diff --git a/testdata/algo/lvsdb_read_test.lvsdb b/testdata/algo/lvsdb_read_test.lvsdb
new file mode 100644
index 000000000..58faa611b
--- /dev/null
+++ b/testdata/algo/lvsdb_read_test.lvsdb
@@ -0,0 +1,1002 @@
+#%lvsdb-klayout
+
+# Layout
+layout(
+ top(RINGO)
+ unit(0.001)
+
+ # Layer section
+ # This section lists the mask layers (drawing or derived) and their connections.
+
+ # Mask layers
+ layer(bulk '1/0')
+ layer(nwell '1/0')
+ layer(poly '3/0')
+ layer(poly_lbl '3/1')
+ layer(diff_cont '4/0')
+ layer(poly_cont '5/0')
+ layer(metal1 '6/0')
+ layer(metal1_lbl '6/1')
+ layer(via1 '7/0')
+ layer(metal2 '8/0')
+ layer(metal2_lbl '8/1')
+ layer(ntie)
+ layer(psd)
+ layer(ptie)
+ layer(nsd)
+
+ # Mask layer connectivity
+ connect(nwell nwell ntie)
+ connect(poly poly poly_lbl poly_cont)
+ connect(poly_lbl poly)
+ connect(diff_cont diff_cont metal1 ntie psd ptie nsd)
+ connect(poly_cont poly poly_cont metal1)
+ connect(metal1 diff_cont poly_cont metal1 metal1_lbl via1)
+ connect(metal1_lbl metal1)
+ connect(via1 metal1 via1 metal2)
+ connect(metal2 via1 metal2 metal2_lbl)
+ connect(metal2_lbl metal2)
+ connect(ntie nwell diff_cont ntie)
+ connect(psd diff_cont psd)
+ connect(ptie diff_cont ptie)
+ connect(nsd diff_cont nsd)
+
+ # Global nets and connectivity
+ global(bulk BULK)
+ global(ptie BULK)
+
+ # Device class section
+ class(PMOS MOS4)
+ class(NMOS MOS4)
+
+ # Device abstracts section
+ # Device abstracts list the pin shapes of the devices.
+ device(D$PMOS PMOS
+  terminal(S
+   rect(psd (-650 -875) (525 1750))
+  )
+  terminal(G
+   rect(poly (-125 -875) (250 1750))
+  )
+  terminal(D
+   rect(psd (125 -875) (550 1750))
+  )
+  terminal(B
+   rect(nwell (-125 -875) (250 1750))
+  )
+ )
+ device(D$PMOS$1 PMOS
+  terminal(S
+   rect(psd (-675 -875) (550 1750))
+  )
+  terminal(G
+   rect(poly (-125 -875) (250 1750))
+  )
+  terminal(D
+   rect(psd (125 -875) (525 1750))
+  )
+  terminal(B
+   rect(nwell (-125 -875) (250 1750))
+  )
+ )
+ device(D$NMOS NMOS
+  terminal(S
+   rect(nsd (-650 -875) (525 1750))
+  )
+  terminal(G
+   rect(poly (-125 -875) (250 1750))
+  )
+  terminal(D
+   rect(nsd (125 -875) (550 1750))
+  )
+  terminal(B
+   rect(bulk (-125 -875) (250 1750))
+  )
+ )
+ device(D$NMOS$1 NMOS
+  terminal(S
+   rect(nsd (-675 -875) (550 1750))
+  )
+  terminal(G
+   rect(poly (-125 -875) (250 1750))
+  )
+  terminal(D
+   rect(nsd (125 -875) (525 1750))
+  )
+  terminal(B
+   rect(bulk (-125 -875) (250 1750))
+  )
+ )
+
+ # Circuit section
+ # Circuits are the hierarchical building blocks of the netlist.
+ circuit(INV2
+
+  # Circuit boundary
+  rect((-1700 -2440) (3100 7820))
+
+  # Nets with their geometries
+  net(1
+   rect(nwell (-1400 1800) (2800 3580))
+   rect(diff_cont (-1510 -650) (220 220))
+   rect(ntie (-510 -450) (800 680))
+  )
+  net(2 name(IN)
+   rect(poly (-525 -250) (250 2500))
+   rect(poly (-1425 -630) (2100 360))
+   rect(poly (-125 -2230) (250 2500))
+   rect(poly (-1050 -3850) (250 2400))
+   rect(poly (550 1200) (250 2400))
+   rect(poly (-250 -6000) (250 2400))
+   rect(poly (-1050 1200) (250 2400))
+   rect(poly_lbl (-526 -2601) (2 2))
+   rect(poly_cont (-831 -111) (220 220))
+  )
+  net(3 name(OUT)
+   rect(diff_cont (-910 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (1310 -3710) (360 2220))
+   rect(metal1 (-1900 -800) (2220 360))
+   rect(metal1 (-2280 -2400) (360 2840))
+   rect(metal1 (-360 -3600) (360 1560))
+   rect(metal1 (1240 2040) (360 1560))
+   rect(metal1 (-360 -5160) (360 1560))
+   rect(metal1 (-1960 2040) (360 1560))
+   rect(metal1_lbl (1419 -2181) (2 2))
+   rect(psd (-276 524) (525 1750))
+   rect(psd (-2100 -1750) (525 1750))
+   rect(nsd (1050 -5350) (525 1750))
+   rect(nsd (-2100 -1750) (525 1750))
+  )
+  net(4 name(VSS)
+   rect(diff_cont (-110 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(metal1 (-290 -290) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(via1 (-305 -705) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(via1 (-250 -1450) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(metal2 (-1525 -775) (2800 1700))
+   rect(metal2_lbl (-161 -541) (2 2))
+   rect(nsd (-1516 -1186) (550 1750))
+  )
+  net(5 name(VDD)
+   rect(diff_cont (-110 2490) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (-290 -1490) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(via1 (-305 -1505) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(metal2 (-1525 -1575) (2800 1700))
+   rect(metal2_lbl (-151 -1251) (2 2))
+   rect(psd (-1526 -476) (550 1750))
+  )
+  net(6 name(BULK)
+   rect(diff_cont (-110 -2160) (220 220))
+   rect(ptie (-510 -450) (800 680))
+  )
+
+  # Outgoing pins and their connections to nets
+  pin(1)
+  pin(2 name(IN))
+  pin(3 name(OUT))
+  pin(4 name(VSS))
+  pin(5 name(VDD))
+  pin(6 name(BULK))
+
+  # Devices and their connections
+  device(1 D$PMOS
+   device(D$PMOS$1 location(800 0))
+   connect(0 S S)
+   connect(1 S D)
+   connect(0 G G)
+   connect(1 G G)
+   connect(0 D D)
+   connect(1 D S)
+   connect(0 B B)
+   connect(1 B B)
+   location(-400 3200)
+   param(L 0.25)
+   param(W 3.5)
+   param(AS 1.4)
+   param(AD 1.4)
+   param(PS 6.85)
+   param(PD 6.85)
+   terminal(S 3)
+   terminal(G 2)
+   terminal(D 5)
+   terminal(B 1)
+  )
+  device(2 D$NMOS
+   device(D$NMOS$1 location(800 0))
+   connect(0 S S)
+   connect(1 S D)
+   connect(0 G G)
+   connect(1 G G)
+   connect(0 D D)
+   connect(1 D S)
+   connect(0 B B)
+   connect(1 B B)
+   location(-400 -400)
+   param(L 0.25)
+   param(W 3.5)
+   param(AS 1.4)
+   param(AD 1.4)
+   param(PS 6.85)
+   param(PD 6.85)
+   terminal(S 3)
+   terminal(G 2)
+   terminal(D 4)
+   terminal(B 6)
+  )
+
+ )
+ circuit(INV2PAIR
+
+  # Circuit boundary
+  rect((0 -1640) (5740 7820))
+
+  # Nets with their geometries
+  net(1 name(BULK))
+  net(2
+   rect(diff_cont (4230 3290) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (2350 -1490) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+  )
+  net(3
+   rect(diff_cont (4230 890) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(metal1 (2350 -290) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+  )
+  net(4
+   rect(diff_cont (790 890) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(5)
+  net(6
+   rect(diff_cont (3430 890) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(7)
+
+  # Outgoing pins and their connections to nets
+  pin(1 name(BULK))
+  pin(2)
+  pin(3)
+  pin(4)
+  pin(5)
+  pin(6)
+  pin(7)
+
+  # Subcircuits and their connections
+  circuit(1 INV2 location(1700 800)
+   pin(0 7)
+   pin(1 5)
+   pin(2 4)
+   pin(3 3)
+   pin(4 2)
+   pin(5 1)
+  )
+  circuit(2 INV2 location(4340 800)
+   pin(0 7)
+   pin(1 4)
+   pin(2 6)
+   pin(3 3)
+   pin(4 2)
+   pin(5 1)
+  )
+
+ )
+ circuit(RINGO
+
+  # Circuit boundary
+  rect((-1720 -2440) (26880 7820))
+
+  # Nets with their geometries
+  net(1 name(FB)
+   rect(diff_cont (20210 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (-22130 -2290) (360 360))
+   rect(via1 (-305 -305) (250 250))
+   rect(via1 (23190 -250) (250 250))
+   rect(metal2 (-23765 -325) (23840 400))
+   rect(metal2_lbl (-22121 -201) (2 2))
+  )
+  net(2 name(OSC)
+   rect(diff_cont (22850 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(via1 (1365 -2235) (250 250))
+   rect(metal2 (-325 -325) (400 400))
+   rect(metal2_lbl (-201 -201) (2 2))
+  )
+  net(3 name(VDD)
+   rect(diff_cont (7810 2490) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (12980 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (7700 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (7700 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (-21410 -10) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (-16200 -2600) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (12840 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (7560 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (7560 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal2_lbl (-21301 -1181) (2 2))
+  )
+  net(4 name(VSS)
+   rect(diff_cont (7810 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (12980 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (7700 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (7700 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(metal1 (-21410 -1330) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (-16200 -80) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (12840 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (7560 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (7560 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal2_lbl (-21301 -381) (2 2))
+  )
+  net(5
+   rect(diff_cont (1730 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(6
+   rect(diff_cont (17570 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(7
+   rect(diff_cont (12290 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(8
+   rect(diff_cont (7010 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+
+  # Outgoing pins and their connections to nets
+  pin(1 name(FB))
+  pin(2 name(OSC))
+  pin(3 name(VDD))
+  pin(4 name(VSS))
+
+  # Subcircuits and their connections
+  circuit(1 INV2PAIR location(19420 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(3 1)
+   pin(4 6)
+   pin(5 2)
+   pin(6 3)
+  )
+  circuit(2 INV2PAIR location(-1700 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 1)
+   pin(5 5)
+   pin(6 3)
+  )
+  circuit(3 INV2PAIR location(3580 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 5)
+   pin(5 8)
+   pin(6 3)
+  )
+  circuit(4 INV2PAIR location(8860 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 8)
+   pin(5 7)
+   pin(6 3)
+  )
+  circuit(5 INV2PAIR location(14140 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 7)
+   pin(5 6)
+   pin(6 3)
+  )
+
+ )
+)
+
+# Reference netlist
+reference(
+
+ # Device class section
+ class(PMOS MOS4)
+ class(NMOS MOS4)
+
+ # Circuit section
+ # Circuits are the hierarchical building blocks of the netlist.
+ circuit(INV2
+
+  # Nets
+  net(1 name('1'))
+  net(2 name('2'))
+  net(3 name('3'))
+  net(4 name('4'))
+  net(5 name('5'))
+  net(6 name('6'))
+
+  # Outgoing pins and their connections to nets
+  pin(1 name('1'))
+  pin(2 name('2'))
+  pin(3 name('3'))
+  pin(4 name('4'))
+  pin(5 name('5'))
+  pin(6 name('6'))
+
+  # Devices and their connections
+  device(1 PMOS
+   name($1)
+   param(L 0.25)
+   param(W 3.5)
+   param(AS 1.4)
+   param(AD 1.4)
+   param(PS 6.85)
+   param(PD 6.85)
+   terminal(S 3)
+   terminal(G 2)
+   terminal(D 5)
+   terminal(B 1)
+  )
+  device(2 NMOS
+   name($3)
+   param(L 0.25)
+   param(W 3.5)
+   param(AS 1.4)
+   param(AD 1.4)
+   param(PS 6.85)
+   param(PD 6.85)
+   terminal(S 3)
+   terminal(G 2)
+   terminal(D 4)
+   terminal(B 6)
+  )
+
+ )
+ circuit(INV2PAIR
+
+  # Nets
+  net(1 name('1'))
+  net(2 name('2'))
+  net(3 name('3'))
+  net(4 name('4'))
+  net(5 name('5'))
+  net(6 name('6'))
+  net(7 name('7'))
+
+  # Outgoing pins and their connections to nets
+  pin(1 name('1'))
+  pin(2 name('2'))
+  pin(3 name('3'))
+  pin(4 name('4'))
+  pin(5 name('5'))
+  pin(6 name('6'))
+  pin(7 name('7'))
+
+  # Subcircuits and their connections
+  circuit(1 INV2 name($1)
+   pin(0 7)
+   pin(1 5)
+   pin(2 4)
+   pin(3 3)
+   pin(4 2)
+   pin(5 1)
+  )
+  circuit(2 INV2 name($2)
+   pin(0 7)
+   pin(1 4)
+   pin(2 6)
+   pin(3 3)
+   pin(4 2)
+   pin(5 1)
+  )
+
+ )
+ circuit(RINGO
+
+  # Nets
+  net(1 name('1'))
+  net(2 name('2'))
+  net(3 name('3'))
+  net(4 name('4'))
+  net(5 name('6'))
+  net(6 name('5'))
+  net(7 name('8'))
+  net(8 name('7'))
+
+  # Outgoing pins and their connections to nets
+  pin(1 name('1'))
+  pin(2 name('2'))
+  pin(3 name('3'))
+  pin(4 name('4'))
+
+  # Subcircuits and their connections
+  circuit(1 INV2PAIR name($1)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(3 1)
+   pin(4 5)
+   pin(5 2)
+   pin(6 3)
+  )
+  circuit(2 INV2PAIR name($2)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 1)
+   pin(5 6)
+   pin(6 3)
+  )
+  circuit(3 INV2PAIR name($3)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 6)
+   pin(5 7)
+   pin(6 3)
+  )
+  circuit(4 INV2PAIR name($4)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 7)
+   pin(5 8)
+   pin(6 3)
+  )
+  circuit(5 INV2PAIR name($5)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 8)
+   pin(5 5)
+   pin(6 3)
+  )
+
+ )
+)
+
+# Cross reference
+xref(
+ circuit(INV2 INV2 match
+  xref(
+   net(1 1 match)
+   net(6 6 match)
+   net(2 2 match)
+   net(3 3 match)
+   net(5 5 match)
+   net(4 4 match)
+   pin(0 0 match)
+   pin(5 5 match)
+   pin(1 1 match)
+   pin(2 2 match)
+   pin(4 4 match)
+   pin(3 3 match)
+   device(1 1 match)
+   device(2 2 match)
+  )
+ )
+ circuit(INV2PAIR INV2PAIR match
+  xref(
+   net(2 2 match)
+   net(3 3 match)
+   net(4 4 match)
+   net(5 5 match)
+   net(6 6 match)
+   net(7 7 match)
+   net(1 1 match)
+   pin(1 1 match)
+   pin(2 2 match)
+   pin(3 3 match)
+   pin(4 4 match)
+   pin(5 5 match)
+   pin(6 6 match)
+   pin(0 0 match)
+   circuit(1 1 match)
+   circuit(2 2 match)
+  )
+ )
+ circuit(RINGO RINGO match
+  xref(
+   net(5 6 match)
+   net(6 5 match)
+   net(7 8 match)
+   net(8 7 match)
+   net(1 1 match)
+   net(2 2 match)
+   net(3 3 match)
+   net(4 4 match)
+   pin(0 0 match)
+   pin(1 1 match)
+   pin(2 2 match)
+   pin(3 3 match)
+   circuit(1 1 match)
+   circuit(2 2 match)
+   circuit(3 3 match)
+   circuit(4 4 match)
+   circuit(5 5 match)
+  )
+ )
+)
diff --git a/testdata/algo/lvsdb_read_test2.lvsdb b/testdata/algo/lvsdb_read_test2.lvsdb
new file mode 100644
index 000000000..e1a8825f8
--- /dev/null
+++ b/testdata/algo/lvsdb_read_test2.lvsdb
@@ -0,0 +1,1013 @@
+#%lvsdb-klayout
+
+# Layout
+layout(
+ top(RINGO)
+ unit(0.001)
+
+ # Layer section
+ # This section lists the mask layers (drawing or derived) and their connections.
+
+ # Mask layers
+ layer(bulk '1/0')
+ layer(nwell '1/0')
+ layer(poly '3/0')
+ layer(poly_lbl '3/1')
+ layer(diff_cont '4/0')
+ layer(poly_cont '5/0')
+ layer(metal1 '6/0')
+ layer(metal1_lbl '6/1')
+ layer(via1 '7/0')
+ layer(metal2 '8/0')
+ layer(metal2_lbl '8/1')
+ layer(ntie)
+ layer(psd)
+ layer(ptie)
+ layer(nsd)
+
+ # Mask layer connectivity
+ connect(nwell nwell ntie)
+ connect(poly poly poly_lbl poly_cont)
+ connect(poly_lbl poly)
+ connect(diff_cont diff_cont metal1 ntie psd ptie nsd)
+ connect(poly_cont poly poly_cont metal1)
+ connect(metal1 diff_cont poly_cont metal1 metal1_lbl via1)
+ connect(metal1_lbl metal1)
+ connect(via1 metal1 via1 metal2)
+ connect(metal2 via1 metal2 metal2_lbl)
+ connect(metal2_lbl metal2)
+ connect(ntie nwell diff_cont ntie)
+ connect(psd diff_cont psd)
+ connect(ptie diff_cont ptie)
+ connect(nsd diff_cont nsd)
+
+ # Global nets and connectivity
+ global(bulk BULK)
+ global(ptie BULK)
+
+ # Device class section
+ class(PMOS MOS4)
+ class(NMOS MOS4)
+
+ # Device abstracts section
+ # Device abstracts list the pin shapes of the devices.
+ device(D$PMOS PMOS
+  terminal(S
+   rect(psd (-650 -875) (525 1750))
+  )
+  terminal(G
+   rect(poly (-125 -875) (250 1750))
+  )
+  terminal(D
+   rect(psd (125 -875) (550 1750))
+  )
+  terminal(B
+   rect(nwell (-125 -875) (250 1750))
+  )
+ )
+ device(D$PMOS$1 PMOS
+  terminal(S
+   rect(psd (-675 -875) (550 1750))
+  )
+  terminal(G
+   rect(poly (-125 -875) (250 1750))
+  )
+  terminal(D
+   rect(psd (125 -875) (525 1750))
+  )
+  terminal(B
+   rect(nwell (-125 -875) (250 1750))
+  )
+ )
+ device(D$NMOS NMOS
+  terminal(S
+   rect(nsd (-650 -875) (525 1750))
+  )
+  terminal(G
+   rect(poly (-125 -875) (250 1750))
+  )
+  terminal(D
+   rect(nsd (125 -875) (550 1750))
+  )
+  terminal(B
+   rect(bulk (-125 -875) (250 1750))
+  )
+ )
+ device(D$NMOS$1 NMOS
+  terminal(S
+   rect(nsd (-675 -875) (550 1750))
+  )
+  terminal(G
+   rect(poly (-125 -875) (250 1750))
+  )
+  terminal(D
+   rect(nsd (125 -875) (525 1750))
+  )
+  terminal(B
+   rect(bulk (-125 -875) (250 1750))
+  )
+ )
+
+ # Circuit section
+ # Circuits are the hierarchical building blocks of the netlist.
+ circuit(INV2
+
+  # Circuit boundary
+  rect((-1700 -2440) (3100 7820))
+
+  # Nets with their geometries
+  net(1
+   rect(nwell (-1400 1800) (2800 3580))
+   rect(diff_cont (-1510 -650) (220 220))
+   rect(ntie (-510 -450) (800 680))
+  )
+  net(2 name(IN)
+   rect(poly (-525 -250) (250 2500))
+   rect(poly (-1425 -630) (2100 360))
+   rect(poly (-125 -2230) (250 2500))
+   rect(poly (-1050 -3850) (250 2400))
+   rect(poly (550 1200) (250 2400))
+   rect(poly (-250 -6000) (250 2400))
+   rect(poly (-1050 1200) (250 2400))
+   rect(poly_lbl (-526 -2601) (2 2))
+   rect(poly_cont (-831 -111) (220 220))
+  )
+  net(3 name(OUT)
+   rect(diff_cont (-910 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (1310 -3710) (360 2220))
+   rect(metal1 (-1900 -800) (2220 360))
+   rect(metal1 (-2280 -2400) (360 2840))
+   rect(metal1 (-360 -3600) (360 1560))
+   rect(metal1 (1240 2040) (360 1560))
+   rect(metal1 (-360 -5160) (360 1560))
+   rect(metal1 (-1960 2040) (360 1560))
+   rect(metal1_lbl (1419 -2181) (2 2))
+   rect(psd (-276 524) (525 1750))
+   rect(psd (-2100 -1750) (525 1750))
+   rect(nsd (1050 -5350) (525 1750))
+   rect(nsd (-2100 -1750) (525 1750))
+  )
+  net(4 name(VSS)
+   rect(diff_cont (-110 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(metal1 (-290 -290) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(via1 (-305 -705) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(via1 (-250 -1450) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(metal2 (-1525 -775) (2800 1700))
+   rect(metal2_lbl (-161 -541) (2 2))
+   rect(nsd (-1516 -1186) (550 1750))
+  )
+  net(5 name(VDD)
+   rect(diff_cont (-110 2490) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (-290 -1490) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(via1 (-305 -1505) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(via1 (-250 150) (250 250))
+   rect(metal2 (-1525 -1575) (2800 1700))
+   rect(metal2_lbl (-151 -1251) (2 2))
+   rect(psd (-1526 -476) (550 1750))
+  )
+  net(6 name(BULK)
+   rect(diff_cont (-110 -2160) (220 220))
+   rect(ptie (-510 -450) (800 680))
+  )
+
+  # Outgoing pins and their connections to nets
+  pin(1)
+  pin(2 name(IN))
+  pin(3 name(OUT))
+  pin(4 name(VSS))
+  pin(5 name(VDD))
+  pin(6 name(BULK))
+
+  # Devices and their connections
+  device(1 D$PMOS
+   device(D$PMOS$1 location(800 0))
+   connect(0 S S)
+   connect(1 S D)
+   connect(0 G G)
+   connect(1 G G)
+   connect(0 D D)
+   connect(1 D S)
+   connect(0 B B)
+   connect(1 B B)
+   location(-400 3200)
+   param(L 0.25)
+   param(W 3.5)
+   param(AS 1.4)
+   param(AD 1.4)
+   param(PS 6.85)
+   param(PD 6.85)
+   terminal(S 3)
+   terminal(G 2)
+   terminal(D 5)
+   terminal(B 1)
+  )
+  device(2 D$NMOS
+   device(D$NMOS$1 location(800 0))
+   connect(0 S S)
+   connect(1 S D)
+   connect(0 G G)
+   connect(1 G G)
+   connect(0 D D)
+   connect(1 D S)
+   connect(0 B B)
+   connect(1 B B)
+   location(-400 -400)
+   param(L 0.25)
+   param(W 3.5)
+   param(AS 1.4)
+   param(AD 1.4)
+   param(PS 6.85)
+   param(PD 6.85)
+   terminal(S 3)
+   terminal(G 2)
+   terminal(D 4)
+   terminal(B 6)
+  )
+
+ )
+ circuit(INV2PAIR
+
+  # Circuit boundary
+  rect((0 -1640) (5740 7820))
+
+  # Nets with their geometries
+  net(1 name(BULK))
+  net(2
+   rect(diff_cont (4230 3290) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (2350 -1490) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+  )
+  net(3
+   rect(diff_cont (4230 890) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(metal1 (2350 -290) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+  )
+  net(4
+   rect(diff_cont (790 890) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(5)
+  net(6
+   rect(diff_cont (3430 890) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(7)
+
+  # Outgoing pins and their connections to nets
+  pin(1 name(BULK))
+  pin(2)
+  pin(3)
+  pin(4)
+  pin(5)
+  pin(6)
+  pin(7)
+
+  # Subcircuits and their connections
+  circuit(1 INV2 location(1700 800)
+   pin(0 7)
+   pin(1 5)
+   pin(2 4)
+   pin(3 3)
+   pin(4 2)
+   pin(5 1)
+  )
+  circuit(2 INV2 location(4340 800)
+   pin(0 7)
+   pin(1 4)
+   pin(2 6)
+   pin(3 3)
+   pin(4 2)
+   pin(5 1)
+  )
+
+ )
+ circuit(RINGO
+
+  # Circuit boundary
+  rect((-1720 -2440) (26880 7820))
+
+  # Nets with their geometries
+  net(1 name(FB)
+   rect(diff_cont (20210 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (-22130 -2290) (360 360))
+   rect(via1 (-305 -305) (250 250))
+   rect(via1 (23190 -250) (250 250))
+   rect(metal2 (-23765 -325) (23840 400))
+   rect(metal2_lbl (-22121 -201) (2 2))
+  )
+  net(2 name(OSC)
+   rect(diff_cont (22850 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(via1 (1365 -2235) (250 250))
+   rect(metal2 (-325 -325) (400 400))
+   rect(metal2_lbl (-201 -201) (2 2))
+  )
+  net(3 name(VDD)
+   rect(diff_cont (7810 2490) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (12980 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (7700 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (7700 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-2860 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -1420) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(metal1 (-21410 -10) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (-16200 -2600) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (12840 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (7560 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (7560 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal2_lbl (-21301 -1181) (2 2))
+  )
+  net(4 name(VSS)
+   rect(diff_cont (7810 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (12980 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (7700 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (7700 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-2860 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 980) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(metal1 (-21410 -1330) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (2280 -1120) (360 1120))
+   rect(metal1 (-16200 -80) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (12840 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (7560 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (7560 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal1 (-3000 -1560) (360 1560))
+   rect(metal1 (-360 -1560) (360 1560))
+   rect(metal2_lbl (-21301 -381) (2 2))
+  )
+  net(5
+   rect(diff_cont (1730 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(6
+   rect(diff_cont (17570 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(7
+   rect(diff_cont (12290 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+  net(8
+   rect(diff_cont (7010 90) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (1380 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 -3820) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-220 -620) (220 220))
+   rect(diff_cont (-1820 3380) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+   rect(diff_cont (-220 180) (220 220))
+  )
+
+  # Outgoing pins and their connections to nets
+  pin(1 name(FB))
+  pin(2 name(OSC))
+  pin(3 name(VDD))
+  pin(4 name(VSS))
+
+  # Subcircuits and their connections
+  circuit(1 INV2PAIR location(19420 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(3 1)
+   pin(4 6)
+   pin(5 2)
+   pin(6 3)
+  )
+  circuit(2 INV2PAIR location(-1700 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 1)
+   pin(5 5)
+   pin(6 3)
+  )
+  circuit(3 INV2PAIR location(3580 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 5)
+   pin(5 8)
+   pin(6 3)
+  )
+  circuit(4 INV2PAIR location(8860 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 8)
+   pin(5 7)
+   pin(6 3)
+  )
+  circuit(5 INV2PAIR location(14140 -800)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 7)
+   pin(5 6)
+   pin(6 3)
+  )
+
+ )
+)
+
+# Reference netlist
+reference(
+
+ # Device class section
+ class(PMOS MOS4)
+ class(NMOS MOS4)
+
+ # Circuit section
+ # Circuits are the hierarchical building blocks of the netlist.
+ circuit(INV2
+
+  # Nets
+  net(1 name('1'))
+  net(2 name('2'))
+  net(3 name('3'))
+  net(4 name('4'))
+  net(5 name('5'))
+  net(6 name('6'))
+
+  # Outgoing pins and their connections to nets
+  pin(1 name('1'))
+  pin(2 name('2'))
+  pin(3 name('3'))
+  pin(4 name('4'))
+  pin(5 name('5'))
+  pin(6 name('6'))
+
+  # Devices and their connections
+  device(1 PMOS
+   name($1)
+   param(L 0.25)
+   param(W 3.5)
+   param(AS 1.4)
+   param(AD 1.4)
+   param(PS 6.85)
+   param(PD 6.85)
+   terminal(S 3)
+   terminal(G 2)
+   terminal(D 5)
+   terminal(B 1)
+  )
+  device(2 NMOS
+   name($3)
+   param(L 0.25)
+   param(W 3.5)
+   param(AS 1.4)
+   param(AD 1.4)
+   param(PS 6.85)
+   param(PD 6.85)
+   terminal(S 3)
+   terminal(G 2)
+   terminal(D 4)
+   terminal(B 6)
+  )
+
+ )
+ circuit(INV2PAIR
+
+  # Nets
+  net(1 name('1'))
+  net(2 name('2'))
+  net(3 name('3'))
+  net(4 name('4'))
+  net(5 name('6'))
+  net(6 name('7'))
+
+  # Outgoing pins and their connections to nets
+  pin(1 name('1'))
+  pin(2 name('2'))
+  pin(3 name('3'))
+  pin(4 name('4'))
+  pin(name('5'))
+  pin(5 name('6'))
+  pin(6 name('7'))
+
+  # Subcircuits and their connections
+  circuit(1 INV2 name($2)
+   pin(0 6)
+   pin(1 4)
+   pin(2 5)
+   pin(3 3)
+   pin(4 2)
+   pin(5 1)
+  )
+
+ )
+ circuit(RINGO
+
+  # Nets
+  net(1 name('1'))
+  net(2 name('2'))
+  net(3 name('3'))
+  net(4 name('4'))
+  net(5 name('6'))
+  net(6 name('5'))
+  net(7 name('8'))
+  net(8 name('7'))
+
+  # Outgoing pins and their connections to nets
+  pin(1 name('1'))
+  pin(2 name('2'))
+  pin(3 name('3'))
+  pin(4 name('4'))
+
+  # Subcircuits and their connections
+  circuit(1 INV2PAIR name($1)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(3 1)
+   pin(4 5)
+   pin(5 2)
+   pin(6 3)
+  )
+  circuit(2 INV2PAIR name($2)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(3 1)
+   pin(4 1)
+   pin(5 6)
+   pin(6 3)
+  )
+  circuit(3 INV2PAIR name($3)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 6)
+   pin(5 7)
+   pin(6 3)
+  )
+  circuit(4 INV2PAIR name($4)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 7)
+   pin(5 8)
+   pin(6 3)
+  )
+  circuit(5 INV2PAIR name($5)
+   pin(0 4)
+   pin(1 3)
+   pin(2 4)
+   pin(4 8)
+   pin(5 5)
+   pin(6 3)
+  )
+
+ )
+ circuit(INV2PAIRX
+
+  # Nets
+  net(1 name('1'))
+  net(2 name('2'))
+  net(3 name('3'))
+  net(4 name('4'))
+  net(5 name('6'))
+  net(6 name('7'))
+
+  # Outgoing pins and their connections to nets
+  pin(1 name('1'))
+  pin(2 name('2'))
+  pin(3 name('3'))
+  pin(4 name('4'))
+  pin(name('5'))
+  pin(5 name('6'))
+  pin(6 name('7'))
+
+  # Subcircuits and their connections
+  circuit(1 INV2 name($2)
+   pin(0 6)
+   pin(1 4)
+   pin(2 5)
+   pin(3 3)
+   pin(4 2)
+   pin(5 1)
+  )
+
+ )
+)
+
+# Cross reference
+xref(
+ circuit(() INV2PAIRX mismatch
+  xref(
+  )
+ )
+ circuit(INV2 INV2 match
+  xref(
+   net(1 1 match)
+   net(6 6 match)
+   net(2 2 match)
+   net(3 3 match)
+   net(5 5 match)
+   net(4 4 match)
+   pin(0 0 match)
+   pin(5 5 match)
+   pin(1 1 match)
+   pin(2 2 match)
+   pin(4 4 match)
+   pin(3 3 match)
+   device(1 1 match)
+   device(2 2 match)
+  )
+ )
+ circuit(INV2PAIR INV2PAIR nomatch
+  xref(
+   net(4 () mismatch)
+   net(2 2 mismatch)
+   net(3 3 mismatch)
+   net(5 4 match)
+   net(6 5 match)
+   net(7 6 mismatch)
+   net(1 1 mismatch)
+   pin(() 4 mismatch)
+   pin(3 () mismatch)
+   pin(1 1 match)
+   pin(2 2 match)
+   pin(4 3 match)
+   pin(5 5 match)
+   pin(6 6 match)
+   pin(0 0 match)
+   circuit(() 1 mismatch)
+   circuit(1 () mismatch)
+   circuit(2 () mismatch)
+  )
+ )
+ circuit(RINGO RINGO skipped
+  xref(
+  )
+ )
+)
diff --git a/testdata/python/dbLayoutVsSchematic.py b/testdata/python/dbLayoutVsSchematic.py
index 95e8e67e5..bb7dfc8ca 100644
--- a/testdata/python/dbLayoutVsSchematic.py
+++ b/testdata/python/dbLayoutVsSchematic.py
@@ -148,7 +148,7 @@ class DBLayoutToNetlistTests(unittest.TestCase):
 
     lvs = pya.LayoutVsSchematic()
 
-    infile = os.path.join(ut_testsrc, "testdata", "algo", "lvs_test1b_au.lvsdb")
+    infile = os.path.join(ut_testsrc, "testdata", "algo", "lvsdb_read_test.lvsdb")
     lvs.read(infile)
 
     tmp = os.path.join(ut_testtmp, "tmp.lvsdb")
diff --git a/testdata/python/dbNetlistCrossReference.py b/testdata/python/dbNetlistCrossReference.py
index fd0d40c31..e32f8250b 100644
--- a/testdata/python/dbNetlistCrossReference.py
+++ b/testdata/python/dbNetlistCrossReference.py
@@ -32,7 +32,7 @@ class DBLayoutToNetlistTests(unittest.TestCase):
     xref = pya.NetlistCrossReference()
 
     lvs = pya.LayoutVsSchematic()
-    infile = os.path.join(ut_testsrc, "testdata", "algo", "lvs_test1b_au.lvsdb")
+    infile = os.path.join(ut_testsrc, "testdata", "algo", "lvsdb_read_test.lvsdb")
     lvs.read(infile)
 
     reader = pya.NetlistSpiceReader()
@@ -79,7 +79,7 @@ class DBLayoutToNetlistTests(unittest.TestCase):
     ut_testsrc = os.getenv("TESTSRC")
 
     lvs = pya.LayoutVsSchematic()
-    input = os.path.join(ut_testsrc, "testdata", "algo", "lvs_test2b_au.lvsdb")
+    input = os.path.join(ut_testsrc, "testdata", "algo", "lvsdb_read_test2.lvsdb")
     lvs.read(input)
 
     xref = lvs.xref()
diff --git a/testdata/ruby/dbLayoutVsSchematic.rb b/testdata/ruby/dbLayoutVsSchematic.rb
index 6118824bc..44653f245 100644
--- a/testdata/ruby/dbLayoutVsSchematic.rb
+++ b/testdata/ruby/dbLayoutVsSchematic.rb
@@ -146,7 +146,7 @@ class DBLayoutVsSchematic_TestClass < TestBase
 
     lvs = RBA::LayoutVsSchematic::new
 
-    input = File.join($ut_testsrc, "testdata", "algo", "lvs_test1b_au.lvsdb")
+    input = File.join($ut_testsrc, "testdata", "algo", "lvsdb_read_test.lvsdb")
     lvs.read(input)
 
     tmp = File::join($ut_testtmp, "tmp.lvsdb")
diff --git a/testdata/ruby/dbNetlistCrossReference.rb b/testdata/ruby/dbNetlistCrossReference.rb
index 0349ac6e3..44399cc70 100644
--- a/testdata/ruby/dbNetlistCrossReference.rb
+++ b/testdata/ruby/dbNetlistCrossReference.rb
@@ -31,7 +31,7 @@ class DBNetlistCrossReference_TestClass < TestBase
     xref = RBA::NetlistCrossReference::new
 
     lvs = RBA::LayoutVsSchematic::new
-    input = File.join($ut_testsrc, "testdata", "algo", "lvs_test1b_au.lvsdb")
+    input = File.join($ut_testsrc, "testdata", "algo", "lvsdb_read_test.lvsdb")
     lvs.read(input)
 
     reader = RBA::NetlistSpiceReader::new
@@ -54,7 +54,7 @@ class DBNetlistCrossReference_TestClass < TestBase
   def test_2_CircuitPairs
 
     lvs = RBA::LayoutVsSchematic::new
-    input = File.join($ut_testsrc, "testdata", "algo", "lvs_test2b_au.lvsdb")
+    input = File.join($ut_testsrc, "testdata", "algo", "lvsdb_read_test2.lvsdb")
     lvs.read(input)
 
     xref = lvs.xref