source($drc_test_source)
target($drc_test_target)

deep

input(2,0).output(2, 0)
input(3,0).output(3, 0)
input(4,0).output(4, 0)
input(9,0).output(9, 0)

input(2,0).edges.extents(10.nm, 10.nm).output(102, 0)
input(3,0).edges.extents(10.nm, 20.nm).output(103, 0)
input(4,0).edges.extents(20.nm, 10.nm).output(104, 0)
input(9,0).edges.extents(20.nm).output(109, 0)
labels(9,0).extents(50.nm, 100.nm).output(109, 1)