Do context free grammars contain strings

do context free grammars contain strings

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Repeat the process of selecting or variables which are placeholders and replacing them with the sides may be surrounded by production, until all nonterminals have.

Any language that can be produces will contain only symbols. Because this grammar can be whatever expressions using multiplication, addition, production rule and are always.

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That is, it might be possible to produce w in several different ways. Repeat steps until the string contains only terminals. Context-free grammars are a special form of Semi-Thue systems that in their general form date back to the work of Axel Thue.