4. (15 pts) For each of the following fanguages, write a grammar that describes the language....
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4. (15 pts) For each of the following fanguages, write a grammar that describes the language. a. (5 pts) The set of strings that begin with ab and end with ba, over alphabet (a, b). Note: the string aba is in the language. b. (5 pts) Strings that consist of a sequence of a's followed by a sequence of b's, where the number of a's is odd, and equal to the number of b's, over alphabet {a,b}. In other words, the language labn | n20 and n is odd}. 4. (15 pts) For each of the following fanguages, write a grammar that describes the language. a. (5 pts) The set of strings that begin with ab and end with ba, over alphabet (a, b). Note: the string aba is in the language. b. (5 pts) Strings that consist of a sequence of a's followed by a sequence of b's, where the number of a's is odd, and equal to the number of b's, over alphabet {a,b}. In other words, the language labn | n20 and n is odd}.
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