/usr/share/doc/libboost1.74-doc/examples/libs/polygon/example/input_data/primary/primary_060.txt

0 11
1 -1 5 -5
-4 -1 -4 0
-1 -3 -4 -1
0 -3 -1 -3
1 -3 0 -3
-4 0 -4 -1
-3 1 -4 0
-1 1 -1 0
-1 0 2 0
-1 0 -1 -3
-1 -3 0 -3

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