1  2  1
  1  3  1
  2  4  0.3
  2  5  0.5
  3  6  0.4
  3  7  0.8
  4  8  0.2
  4  9  0.7
  5  10  0.5
  5  11  0.3
  6  12  0.4
  6  13  0.8
  7  14  0.3
  7  15  0.6