If I am not mistaken this assumes you know the names of the three file to compare.

What I need is a script that assumes you do not know the names "x1" "x2" "x3" at the start.

Say you have a directory of 1000 files - the question is do any three (or more) of these 1000 files have the same size.

or another way to satisfy my needs would be a script:

Do the last three files created have the same size?

Thanks.