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round robin

  1. a document, as a petition, protest, etc., with the signatures written in a circle to conceal the order of signing
  2. a contest or tournament, as in tennis, chess, etc., in which every entrant is matched with every other one
  3. a letter circulated among the members of a group, which is signed and forwarded by each in turn, often with additional comments, etc.

See round robin in American Heritage Dictionary 4

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