sumo#rational_number  real_number that is the product of dividing two integers
  closed_exclusion:  irrational_number
  supertype:  real_number  a number that can be expressed as a (possibly infinite) decimal, i.e. a number that has a position on the number line
  equal:  rational (pm)
  subtype:  integer  a negative or nonnegative whole number
     subtype:  nonnegative_integer__nonnegativeinteger  integer >= 0
        subtype:  positive_integer  integer > 0
        subtype:  zero  class containing only 0
     subtype:  negative_integer  integer < 0
     subtype:  even_integer  integer that is evenly divisible by 2
     subtype:  odd_integer__oddinteger  integer that is not evenly divisible by 2
     subtype:  prime_number__primenumber

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