Configuration record index

It is possible to narrow the search to a particular index by adding the index name in brackets after the term itself. For example, "aspirin[CompleteSynonym]" returns only a single record, the actual structure of aspirin, because only that record has a synonym that matches that query exactly. Also, this shows that some Entrez indices are configured to require an exact match to the entire index, while others allow matches to any individual word in the longer text. 

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