Question: Problem 2 . Prove that for any singleton string and for any string , (1) ()=. (2) ()r=. (3) r=. (4) = Problem 3. Prove
Problem 2 . Prove that for any singleton string and for any string , (1) ()=. (2) ()r=. (3) r=. (4) = Problem 3. Prove that for any string = and for any string , (1) ()=. (2) ()r=r. Problem 4. Prove that for any non-empty string T, (1) ()=. (2) ()r=r
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