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Allow empty string in CFG's + more (#2888)
* Allow for empty string terminals * Move toy pcfg's into pcfg_demo * Deal with removing toy_pcfg1 and 2 from nltk/grammar.py * Added doctests for empty strings/productions and their consequences * Reworked RecursionError * Add doctest for generate RecursionError * Fixed issue in incorrect explanation of doctest * Add as contributor
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