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Give a context-free grammar to generate each of the following languages: (e) The set of all strings over {num, +, -, *,/3 which are legal

Give a context-free grammar to generate each of the following languages:

(e) The set of all strings over {num, +, -, ,/3 which are legal binary postfix expressions. Thus num, num num +, num num num -, and num num - num * are all in the language, while , num *, and num num num-are not in the language

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