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Comment: added some explanation as to why LVG is "effectively required" for good dictionary lookup results (as stated in Component Use Guide)

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This annotator wraps the National Library of Medicine (NLM) SPECIALIST lexical tools. It generates a canonical form for words, and this normalization step is helpful for dictionary lookup. It also generates a list of lemma entries with Penn Treebank tags. These tags could be useful for a part of speech (POS) tagger. However, for the OpenNLP POS tagger, we use a tag dictionary rather than lemma information.

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