nltk.CFG.leftcorners¶
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CFG.
leftcorners
(cat)[source]¶ Return the set of all nonterminals that the given nonterminal can start with, including itself.
This is the reflexive, transitive closure of the immediate leftcorner relation: (A > B) iff (A -> B beta)
Parameters: cat (Nonterminal) – the parent of the leftcorners Returns: the set of all leftcorners Return type: set(Nonterminal)