Question: Construct context - free grammars for the following languages: The set of words with even number of a ' s or odd number of b

Construct context-free grammars for the following languages:
The set of words with even number of a's or odd number of b's
L ={anb2namb2m | m 1 and n 1}
The set of words that have more a's than b's.

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