Merge Preferences

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Recommending systems are very popular now.Many commercial websites use it to recommend items to their users.Sometimes merging preferences is a difficult task because different users have different preferences. A user's preference is a linear order of items. For example there are 3 items, namely 1,2,3 and 3 users. The first user prefers item 1 to item 2 and prefers item 2 to item 3. So his/her pref

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