#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
  supertype:  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"
        supertype:  array  an orderly arrangement: "an array of troops in battle order"
           supertype:  arrangement  an orderly grouping (of things or persons)
              supertype:  group__grouping  any number of entities (members) considered as a unit
                 supertype:  collection  something gathering separated things (entities/situations)
                    supertype:  divisible_entity__divisibleentity  many classifications under this category are application-dependant
                       supertype:  entity  something that can be "involved" in a situation
                          supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                       supertype:  divisible_thing__divisiblething
                          supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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