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[–] brux ago 

Strings are lists of characters. I.e., words or sentences. See the answer below. :)

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[–] hopo ago 

I would have just used a hash set. Does not require sorting and you just have to iterate through the list once for a time complexity of O(n)

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[–] brux ago 

This is the answer I look for when I interview someone. Though, putting them in a list and sorting them is also an interesting (but not optimal) answer.