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Some sources are special cases and need special handling.  Included in this category are the NCI Thesaurus in OWL format and any files loaded from UMLS RRF formatted sources.  The NCI MetaThesaurus is the largest terminology we load and as such it also requires special handling.  OWL terminologies do not normally require special handling, but LexEVS offers some advanced loading options users can take advantage of if so desired. At the bottom of the page we link to tutorials for each of these.

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