-- SAMPLE 1 --
4
 0  0
 0 10
10 00
10 10
-- SAMPLE 2 --
14
  0   0
100   0
 20  20
100  40
 60  60
100  80
 20 100
100 120
  0 120
 80 100
  0  80
 40  60
  0  40
 80  20
