#population.group  a group of organisms of the same species populating a given area; "they hired hunters to keep down the deer population"
  subtype:  #overpopulation  too much population
  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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