Pellaz

I've got a list of values that look like x y, where x is a name and y is a number. What I need to do is input this list into a program, then input an updated list with some different y values and have it tell me which have changed, in anyway from just highlighting the ones that changed to discarding all the intersects. Anyone know how I could do this with microsoft work spreadsheet or a shareware program? I've tried google, but haven't been able to find what I need, although I might not be using the right terminology to get the right returns.

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