Is there a formula the counts the number of matches between two columns for
the same row? For instance

2 1
3 3
5 3
1 3
2 2
5 3
5 2
4 5
5 3
3 1
5 2
5 3
4 3
2 2
2 2
5 2
4 4
2 2
5 4
2 1

The formula should say 6 because there are matches in rows 2,5,14,15,17,18

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jake