left   right  parent  child
0.0    0.8    5       9
0.3    1.0    5       10
0.0    1.0    6       8
0.0    0.3    6       10
0.0    0.9    7       11
0.0    1.0    7       12
0.8    1.0    7       9
0.9    1.0    1       11
0.4    1.0    1       6
0.0    0.4    4       6
0.0    1.0    4       7
0.0    1.0    0       1,2,4,5
