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edited Jun 22, 2022 at 7:16

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This appears to be an open question: see Remark 5.23 of Sapir's paper Remark 5.23 of Sapir's paper, which attributes this as a question to Denis Osin.

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created Feb 28, 2013 at 20:25

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This appears to be an open question: see Remark 5.23 of Sapir's paper, which attributes this as a question to Denis Osin.