This class knows how to read two treebank formats, the Penn format and the Chomsky Normal Form (CNF) format. These formats differ in how they handle terminal nodes. The Penn format places pre-terminal part of speech tags in the left-hand position of a parenthesis-delimited pair, just like it does non-terminal nodes.
WWW: http://search.cpan.org/dist/Lingua-Treebank/
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