Chomsky normal form
Chomsky normal form A restricted type of context-free grammar, namely one in which each production has the form A → BC or A → d,
i.e. each right-hand side consists of either two nonterminals or one terminal. Any context-free language is generated by such a grammar, except that derivation of the empty string, Λ, requires the additional production S → Λ
i.e. each right-hand side consists of either two nonterminals or one terminal. Any context-free language is generated by such a grammar, except that derivation of the empty string, Λ, requires the additional production S → Λ
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Chomsky normal form