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given collapsed treebank, print words only
reads penn treebanks, prints out all edges found in each tree, one tree per line
reads penn treebanks, prints out all rewrites found
reads multi-line Penn trees from files or STDIN and outputs trees one per line.
transform a one-tree-per-line treebank into something human-readable
extract vocabularies from Penn treebank files


Object modeling constituent from a treebank
Head-finding in Lingua::Treebank
Perl extension for manipulating the Penn Treebank format