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Sorry if I was unclear with the 2nd set. A better way of putting it might be:

a class has two members x and y
search for an x, read y
search for a new x, read y
do some math with both y's...

I've only worked with arrays and list at this point so for this project I've been using list but I've been wondering if there's a better way. I have 2 sets of data that need to be stored, in both...