be produced with this grammar.

Nonterminal symbols

Nonterminal symbols are those symbols that cannot appear in the formal language defined by a formal grammar. A formal grammar includes a start symbol, which is a designated member of the set of nonterminal symbols. We can derive a set of strings of only terminal symbols by successively applying the production rules. The generated set is a formal language over the set of terminal symbols.

Context-free grammars are those grammars

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