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