Chomsky Normal Form Definition/Meaning:
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, A, requires the
additional production
S → A
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