#departure_time__departuretime__time_of_departure  the time at which a public conveyance is scheduled to depart from a given point of origin
  supertype:  #point_in_time__point  a very short period of time; "at that point I had to leave"
  subtype:  #checkout_time__checkout  the latest time for vacating a hotel room; "the checkout here is 12 noon"

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