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Exercise 5.1.1: Design context-free grammars for the follo * a) The set [0"1" | n2 1), , that is, the set of all strings of one or more 0's followed by an equal number of 1's. "! b) The set fa'Wc i j or j t k), that is, the set of strings of a's followed by b's followed by c's, such that there are either a different number of a's d b's or a different number of b's and c's, or both