Bi Potions

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Its time for the Potions class and Professor Snape is hell-bent on giving a detention to Harry. Today's class has a long table on which N elemental potions (numbered from 1 to N) are arranged. The queerness of the ith potion is A[i]. A unique bipotion can be obtained by mixing together small quantities of exactly two distinct elemental potions. Each unordered pair of distinct elemental potions cor

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