/usr/share/doc/libboost1.74-doc/examples/libs/polygon/example/input_data/polygon/polygon_007.txt

0
12
0 0 8 3
8 3 10 13
10 13 16 6
16 6 16 15
16 15 25 10
25 10 15 1
15 1 27 -1
27 -1 14 -4
14 -4 13 3
13 3 11 -5
11 -5 10 0
10 0 0 0

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