5 12
1 1    1 2    2 1    2 3    2 5    3 2     3 3 
3 4    4 3    5 2    5 3    5 5
  2.0  1.0
  3.0  2.0
  3.0 -1.0
  4.0 -1.0
  6.0  3.0
 -1.0  1.0
 -3.0  2.0
  2.0  0.0
  1.0 -1.0 
  4.0  0.0
  2.0  0.0
  1.0  9.0
  8.0  5.0
 45.0 11.0
 -3.0  8.0
  3.0 -3.0
 19.0 45.0
