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Using the notation of Example 1 . 1 3 , find grammars for the languages below. Assume ? ? = { a , b }

Using the notation of Example 1.13, find grammars for the languages below. Assume ??={a,b}.
(a)L={w:na(w)=nb(w)+1}.
(b)L={w:na(w)>nb(w)}.
*(c)L={w:na(w)=2nb(w)}.
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