Teruyuki Mizuno and I investigate constraints on contrast sluicing in Japanese and English, as in examples such as "I know which book John read, but not which magazine," which has been relatively understudied in the literature on sluicing. For the first time, we discuss contrast sluicing between multiple wh question antecedent and slucing clauses, and observe a curious pattern of grammaticality in Japanese. This pattern constitutes a puzzle for the LF syntax of sluicing and/or pair-list multiple wh questions.

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