Group Operations. The authors express their appreciation to the peer reviewers for their helpful advice and insights -Edouard Al-Dahdah and posthumously Steve Knack, whose wisdom and generosity will be remembered. The authors are also grateful to Camilla Lindstrom and Helena Bjuremalm for their very useful comments; Asmeen Khan, Helene Grandvoinnet, Deborah Isser as well as Marco Larizza for their guidance and comments on various drafts; Barbara Rice for editorial support; and Edward Nyarko for administrative support.

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