#half__one-half__onehalf  one of two equal parts of a divisible whole; "half a loaf" or "half an hour" or "a century and one half"
  supertype:  #common_fraction__simple_fraction  the quotient of two integers
  subtype:  #fifty_percent__fiftypercent  a half expressed as a percentage
  subtype:  #mediety__moiety  one of two (approximately) equal parts

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