0 x                    0                    4                    0
got here
0 0                    0                    4                    4
1 0                    0                    4                  200
got here
1 1                    0                    4                  204
0 1                    0                    4                  400
got here
0 0                    0                    4                  404
1 0                    0                    4                  600
got here
1 1                    0                    4                  604
0 1                    0                    4                  800
got here
0 0                    0                    4                  804
1 0                    0                    4                 1000
got here
1 1                    0                    4                 1004
0 1                    0                    4                 1200
got here
0 0                    0                    4                 1204
1 0                    0                    4                 1400
got here
1 1                    0                    4                 1404
0 1                    0                    4                 1600
got here
0 0                    0                    4                 1604
1 0                    0                    4                 1800
got here
1 1                    0                    4                 1804
0 1                   13                   17                 2000
got here
0 0                   13                   17                 2017
1 0                   13                   17                 2200
got here
1 1                   13                   17                 2217
0 1                   13                   17                 2400
got here
0 0                   13                   17                 2417
1 0                   13                   17                 2600
got here
1 1                   13                   17                 2617
0 1                   13                   17                 2800
got here
0 0                   13                   17                 2817
1 0                   13                   17                 3000
got here
1 1                   13                   17                 3017
0 1                   13                   17                 3200
got here
0 0                   13                   17                 3217
1 0                   13                   17                 3400
got here
1 1                   13                   17                 3417
0 1                   13                   17                 3600
got here
0 0                   13                   17                 3617
1 0                   13                   17                 3800
got here
1 1                   13                   17                 3817
0 1                   13                   17                 4000