Kakuro number combinations - 13

2 Blocks

4 & 9
5 & 8
6 & 7

3 Blocks

1 & 3 & 9
1 & 4 & 8
1 & 5 & 7
2 & 3 & 8
2 & 4 & 7
2 & 5 & 6
3 & 4 & 6

4 Blocks

1 & 2 & 3 & 7