/usr/share/doc/libboost1.74-doc/examples/libs/polygon/example/input_data/polygon/polygon_004.txt

0
8
0 0 0 8
0 8 4 12
4 12 9 13
9 13 7 7
7 7 13 4
13 4 10 0
10 0 5 -1
5 -1 0 0

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