#harmonic_mean  the mean of n numbers expressed as the reciprocal of the arithmetic mean of the reciprocals of the numbers
  supertype:  #mean_value__mean  an average of n numbers computed by adding some function of the numbers and dividing by some function of n
     supertype:  #average__norm  a statistic describing the location of a distribution: "it set the norm for American homes"
        supertype:  #statistic  a datum that can be represented numerically
           supertype:  #datum__data_point  an item of factual information derived from measurement or research
              supertype:  #information  knowledge acquired through study or experience or instruction
                 supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
                    supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                       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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