#time.instant  a suitable moment; "it is time to go"
  supertype:  #instant__moment__minute__second  a particular point in time; "the moment he arrived the party began"
  subtype:  #high_time  the latest possible moment; "it is high time you went to work"
  subtype:  #occasion.time  the time of a particular event; "on the occasion of his 60th birthday"

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