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Define a BNF grammar that generates each of the languages a . { a n b m | n m > 0 } that is
Define a BNF grammar that generates each of the languages
a that is the number of bs can be dots and number of as can be equal to the number of bs or greater, but not less. The as come at the beginning of the string and bs come at the end. NOTE: this is similar to problem # but in problem # and in this problem
b and : that the number of as onn be dots and there is one more than as
c Let be the alphabet consisting of the four symbols and Let be the language over consisting of strings in which both parentheses and brackets are balanced. For example, the string is in L but is not. Find a contextfree grammar that generates the language
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