+ h f^RIt^RIt^RIHtR RltRtRtRtR Rlt] R8Xd ]!4R#R#) N) NonterminalcV'gVP4pVf$\P!4^,^, p\W.V4pV'd\P !WC4pV#)aQ Generates an iterator of all sentences from a CFG. :param grammar: The Grammar used to generate sentences. :param start: The Nonterminal from which to start generate sentences. :param depth: The maximal depth of the generated tree. :param n: The maximum number of sentences to return. :return: An iterator of lists of terminal tokens. )startsysgetrecursionlimit _generate_all itertoolsislice)grammarrdepthniters&&&& 5/usr/lib/python3/dist-packages/nltk/parse/generate.pygeneratersU   }&&(A-2 '5 1D( Kc#"V'dB\W^,V4F'p\WR,V4F pW4,xK K) R#.xR# \dp\R4ThRp?ii;i5i)r:NNz}The grammar has rule(s) that yield infinite recursion! Eventually use a lower 'depth', or a higher 'sys.setrecursionlimit()'.N) _generate_onerRecursionError RuntimeError)r itemsr frag1frag2errors&&& rrr)sq  &wa%@*7"IuEE-'FA H  s( A1>A A1 A. A))A..A1c#"V^8db\V\4'dEVPVR7F,p\WP 4V^, 4RjxL K. R#V.xR#R#L5i)r)lhsN) isinstancer productionsrrhs)r itemr prods&&& rrr9s_ qy dK ( (+++5(((*eaiHHH6&L IsAA/A-A/z S -> NP VP NP -> Det N PP -> P NP VP -> 'slept' | 'saw' NP | 'walked' PP Det -> 'the' | 'a' N -> 'man' | 'park' | 'dog' P -> 'in' | 'with' c^RIHp\RV3,4\\4VP \4p\ \ W R7^4F(wr4\RVRPV43,4K* R#)r)CFGz3Generating the first %d sentences for demo grammar:)r z%3d. %s N) nltk.grammarr#print demo_grammar fromstring enumeraterjoin)Nr#r r sents& rdemor-Ms]  ?1$ FG ,nn\*GXg3Q7 i1chhtn--.8r__main__)NNN)) r rr%rrrrr'r-__name__rrr2s? $0   / zFr