Question: Write a CFG ( Context - free Grammar ) for the following languages. L = fa ^ { m } b ^ { n }

Write a CFG (Context-free Grammar) for the following languages. L=fa^{m}b^{n}c^{m}d^{m} n>=1, m>=1) U ((b^{m}c^{m}d^{n} : n>=1, m>=1)
b)\frac{(a\cup b)^{*}b(a\cup b)*a(a\cup b)*}{\beta}

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