#circumstance  a condition that accompanies or influences some event or activity
  supertype:  #condition.state__status  a condition or state at a particular time: "a condition (or state) of disrepair"; "the current status of the arms negotiations"
  subtype:  #event.circumstance__case  a special set of circumstances; "in that event, the first possibility is excluded"; "it may rain in which case the picnic will be canceled"
  subtype:  #hinge  a circumstance upon which subsequent events depend; "his absence is the hinge of our plan"

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