c Max flow problem for tiling
p min 876 2603
c source node
n 0 940
c sink node
n 875 -940
c source to target arcs
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a 0 800 1 1 0
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a 0 864 1 1 0
c target to tile arcs
a 1 869 0 2 0
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c tile to sink arcs
a 865 875 0 138 0
a 866 875 0 90 0
a 867 875 0 141 0
a 868 875 0 232 0
a 869 875 0 257 0
a 870 875 0 259 0
a 871 875 0 218 0
a 872 875 0 201 0
a 873 875 0 80 0
a 874 875 0 175 0
c overflow arc
a 0 875 0 940 1000
c end of flow problem