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Let |x| a be the number of occurrences of the symbol a in the string x. Define a context-free grammar for the language L =

Let |x|_a be the number of occurrences of the symbol a in the string x.

Define a context-free grammar for the language L = {w {0, 1} : |w|₀ = |w|₁}.

Give a formal proof that your grammar does indeed generate L.

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