# Test case 4 for arbitrary arrangement. See https://cgal.geometryfactory.com/CGAL/Members/wiki/Visibility/TestCases
19
-1 3
0 3
0 2
3 3
1 1
3 0
4 0
5 0
4 -1
7 0
7 -4
2 -4
1 -2
2 0
-1 -4
-10 10
10 10
10 -10
-10 -10
18
0 1
1 2
1 3
3 4
3 5
5 6
7 8
7 9
9 10
10 11
11 12
12 13
11 14
14 0
15 16
16 17
17 18
18 15
