#exchange.group_action  the act of changing one thing for another thing; "the was a short exchange of strokes before Connors won the point"; "Adam was promised immortality in exchange for his disobedience"
  supertype:  group_action__groupaction  action taken by a group of people
  subtype:  rally  an exchange of several strokes
  subtype:  tradeoff__trade-off  an exchange that occurs as a compromise: "I faced a tradeoff between eating and buying my medicine"

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