Question: CFGs Find a context - free grammar G which recognizes the following language: A = { w in Sigma | for every prefix u

CFGs
Find a context-free grammar G which recognizes the following language:
A ={w in \Sigma | for every prefix u of w, n_a(u)>= n_b(u) and n_a(w)= n_b(w)}
Considering the formal definition of context-free grammar, represent the grammar G as a 4-tuple.

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