I've looked through the large number of solutions to the finding unique elements in arrays efficiently problem eg. Find unique elements in an array

However I've none of these appear applicible to my problem: I have large arrays which contain "words" and I'd like to identify the unique words regardless of case.

Is there a simple way of doing that - all the methods for finding unique elements in arrays treat This as different from THIS.

Maybe there is a way of the contents of an array of words to lowercase in an efficient manner?

Any suggestions appriciated - ensuring lowercase when generating the arrays is an obvious option - but not ideal as I need the case info too.

In reply to (almost) Unique elements of an array by Anonymous Monk

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