3.1 Construct context-free grammars that generate the following languages. In all cases, E= {0, 1}. • {0?n1" : n 20} {w: w contains at least three 1s} • {w: the length of w is odd and its middle symbol is 0} • {w: w is a palindrome}. A palindrome is a string w having the property that w w", i.e., reading w from left to right gives the same result as reading w from right to left.

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A: please do upvote for my efforts!   answer: we can use pumping lemma to prove it

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