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Logic problems. The solution to these problems does not usually require a lot of math, but will take some thinking until you find the right approach.
Given a string of 2 letters ab, your task is to convert it into ba.
You are allowed to add either aa or bb on either side of a current string or into the string, like ab=>abaa=>abbb=>aaabbb=>aaabaabb.
You are also allowed to erase either aa or bb any place like aaabbb=>abbb. Is it possible? If so, how?
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