If you use a strong base term as reference, as in the first term in the query it will most likely have a lower resolution compared to using the primary term as a reference since it's only 2 decimals accurate.
So (searchTerm,referenceTerm) is most likely more robust than
(referenceTerm,searchTerm) since the referenceTerm will in most cases be much larger then the search term.
Good idea though, per language seems the best way to go since the size of the languages is so varied.
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