Random math idea of the day: A "group" is a set of objects (numbers in this case) along with some sort of "operation" (we'll call it +), that has some rules. For clarity's sake let's use the set {0,1,2,3,4} with the understanding that 5 is equal to 0 (i.e. 2+3=0, etc). A group behaves like this
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It was f prime.
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