#actinide_series  (chemistry) a series from actinium to lawrencium of 15 radioactive elements with increasing atomic numbers
  supertype:  series  similar things placed in order or happening one after another; "they were investigating a series of bank robberies"
     supertype:  ordering__order  logical or comprehensible arrangement of separate elements; "we shall consider these questions in the inverse order of their presentation"
        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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