     1     2     1     3     2
     3     2     4     3     4
1.0       2.0       3.0
2.0       2.0
5.0       5.0       3.0
2.0       2.0       1.0
0.0       2.0       1.0
2.0       1.0       3.0
3.0       3.0       3.0
1.0       1.0       0.0
