Question: A variable A in a CFG G is called usable if it appears in some derivation of some string w sum L(G). Formulate the problem

A variable A in a CFG G is called usable if

A variable A in a CFG G is called usable if it appears in some derivation of some string w sum L(G). Formulate the problem of deciding whether a variable A is usable in a CFG G as a language problem, and show that it is decidable

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