#exchange.transaction  the act of giving something in return for something received; "deductible losses on sales or exchanges of property are allowable"
  supertype:  transaction__dealing__dealings  the act of transacting within or between groups (as carrying on commercial activities); "no transactions are possible without him"; "he has always been honest is his dealings with me"
  subtype:  logrolling  act of exchanging favors for mutual gain; especially trading of influence or votes among legislators to gain passage of certain projects

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