Factor1 Factor2 X
1 1 18
1 1 20
1 1 16
1 1 17
1 2 15
1 2 11
1 2 15
1 2 11
2 1 24
2 1 19
2 1 23
2 1 21
2 2 15
2 2 15
2 2 16
2 2 12
3 1 15
3 1 9
3 1 11
3 1 12
3 2 19
3 2 15
3 2 14
3 2 18