Question: Let Sigma = { a , b } and let L = { a b | n , m in and n < =

Let \Sigma ={a, b} and let L ={ ab| n, m in and n <= m <=5n }. The CFG for L is given below. Here is a CFG of the language S -> aSb? |\epsi A -> b |\epsi What will be the '?' such that the grammar can describe the language, L correctly. Fill out the question mark with one or more variables/terminals. Write down the missing string only.

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