#vehicle_fleet__vehiclefleet__fleet  group of motor vehicles operating together under the same ownership
  subtype:  #motor_pool  a fleet of military vehicles controlled by a single agency and available for use as needed
  member:  #taxi  #autobus
  part of:  #bus_line
  supertype:  #aggregation__collection__accumulation__assemblage  several things grouped together
     supertype:  #group__grouping  any number of entities (members) considered as a unit
        supertype:  pm#collection  something gathering separated things (entities/situations)
           supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
              supertype:  pm#entity  something that can be "involved" in a situation
                 supertype:  pm#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:  pm#divisible_thing__divisiblething
                 supertype:  pm#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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