0  0
  1  0
  2  0
  3  0
  4  0
  0  1
  1  1
  2  1
  3  1
  4  1
  0  2
  1  2
  2  2
  3  2
  4  2
  0  3
  1  3
  2  3
  0  4
  1  4
  2  4
  1.5  1
  1.5  1.5
  1  1.5