Question: Instead of the concept of live productions in CNF, let us define a live nonterminal to be one appearing at the left side of a

Instead of the concept of live productions in CNF, let us define a live nonterminal to be one appearing at the left side of a live production. A dead nonterminal N is one with only productions of the single form

N → terminal

If m is the number of live nonterminals in a CFG in CNF, prove that any word w of length more than 2m will have self-embedded nonterminals.

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