How to find matches in 2 columns - LinkedIn Connections

HI Christien

Here is the post I was thinking of:

The formula used looks like this:

It might be a little slow, it is going to look, 8000 times, for an entry in a list of 8000 items, so it is 64 million comparisons.

If it gives you the results you are looking for, please share the time it takes? Maybe there are ways to speed up the process.

Regards
Piet