c Max flow problem for tiling
p min 850 2529
c source node
n 0 915
c sink node
n 849 -915
c source to target arcs
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a 0 790 1 1 0
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a 0 792 1 1 0
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a 0 800 1 1 0
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a 0 840 1 1 0
c target to tile arcs
a 1 844 0 1 0
a 1 845 0 1 0
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a 2 844 0 1 0
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c tile to sink arcs
a 841 849 0 50 0
a 842 849 0 79 0
a 843 849 0 147 0
a 844 849 0 167 0
a 845 849 0 180 0
a 846 849 0 153 0
a 847 849 0 202 0
a 848 849 0 28 0
c overflow arc
a 0 849 0 915 1000
c end of flow problem