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7. This problem deals with the following grammar, which has start symbol S. S + SS | xy a. Give a leftmost derivation for the
7. This problem deals with the following grammar, which has start symbol S. S + SS | xy a. Give a leftmost derivation for the string xyxy. b. Give a rightmost derivation for the string xyxy. c. Verify that the grammar is ambiguous by finding a string with two different parse trees. Your answer should consist of the string and the two parse trees. d. Write a non-ambiguous grammar that generates the same language as the above grammar
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