c Max flow problem for tiling
p min 575 1716
c source node
n 0 649
c sink node
n 574 -649
c source to target arcs
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c target to tile arcs
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c tile to sink arcs
a 572 574 0 568 0
a 573 574 0 452 0
c overflow arc
a 0 574 0 649 1000
c end of flow problem