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There is nothing more perfect than perfect, hence, there is no superlative for perfect. Same goes for 'unique'. It means, "One of a kind", and you cannot get more 'one of a kind' than 'one of a kind'. No superlative for 'unique', either.
positive degree=few comparative degree=fewer superlative degree=fewest
Sum is a noun and a verb and, as such, does not have a superlative degree.
The comparative degree is wider.
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