Here's my spreadsheet:

A B C

1 1 1
2 3 3
3 4 6
4 5 10
5 8 11
6 9
7 10
8
9
10
11
12
13


How do I get the matching numbers on the same rows, like:

A B C

1 1 1
2
3 3 3
4 4
5 5
6 6
7
8 8
9 9
10 10 10
11 11
12 13
13