When you say "Select" what do you mean exactly ?
Do you mean "Select" aesthetically (eg Conditional Formatting) or physically (VBA) ?
In terms of Conditional Formatting - a very basic rule would be:
There is a bug with Conditional Format Array Formulae in XL2007 so best to keep as simple as possible (if a little long winded)
The IF approach is simply to minimise no. of COUNTIF calculations being performed (ie pairs only tested in prior pairs not found) - else you could just add the various results
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