#interchange.interaction__reciprocation__give-and-take  mutual interaction; the activity of interchanging or reciprocating
  supertype:  interaction  a mutual or reciprocal action; interacting
  subtype:  reciprocity  mutual exchange of commercial or other privileges
  subtype:  dealings__traffic  social or verbal interchange (usually followed by `with')
     subtype:  relation.dealings  (usually plural) mutual dealings or connections among persons or groups: "international relations"

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