Find & eliminate duplicate keywords in a reference

Sometimes, the same keyword gets assigned to a single reference twice (e.g. because keywords were assigned by the Change Fields function and the reference belonged to two such sessions). A fiunction that would identify and delete such duplicate keywords from a reference would be great. Since this would be great for the entire data base, but might take a while for a large data base, it would be great to have this as a tool which could be started on demand and then automatically work its way through the entire data base over lunch or over night in some kind of a maintanance or cleanup function for the data base, maybe combined with sorting the keywords alphabetically for each reference.


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