#calendar.tabular_array  a tabular array of the days (usually for one year)
  supertype:  #tabular_array__tabulararray__table  a set of data arranged in rows and columns; "see table 1"
  subtype:  #perpetual_calendar__perpetualcalendar  a chart or mechanical device that indicates the days of the week corresponding to any given date over a long period of years

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