#schedule  an ordered list of times at which things are planned to occur
  supertype:  #listing__list  a database containing an ordered array of items (names or topics)
  subtype:  #network_programming  the schedule of programs to be broadcast on a network
  subtype:  #timetable.schedule  a schedule of times of arrivals and departures
  subtype:  #timetable  a schedule listing events and the times at which they will take place

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