Count duplicate sets of 2 numbers

Hi Experts,

I have 7 numbers in columns A:G and would like to count how many duplicate sets of 2 numbers are there.

For instance, the result of (2 0 2 6 1 0 2) should be 2 because there are only 2 same set of duplicates (02 & 02).

Appreciate if someone could provide me a formula, I have attached the sample also for easy reference.

Thanks