Question: Find context - free grammars for the following languages ( with n > = 0 , m > = 0 ) . L = {

Find context-free grammars for the following languages (with n >=0, m >=0).
L ={anbm : n <= m +3}.
L ={anbm : n = m 1}.
L ={anbm : n !=2m}.

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