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the odd one out

(also the odd man out)

Definition

a person or thing that is different from or kept apart from others that form a group or set: Guess which number of the following sequence is the odd one out. She was always the odd one out at school - she didn't have many friends.Different and difference
(Definition of the odd one out from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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