/usr/share/doc/libboost1.74-doc/examples/libs/polygon/example/input_data/polygon/polygon_008.txt

0
10
0 0 1 8
1 8 10 7
10 7 20 10
20 10 25 9
25 9 28 5
28 5 23 -2
23 -2 24 -7
24 -7 13 -9
13 -9 10 -3
10 -3 0 0

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