#root.number  a number that when multiplied by itself some number of times equals a given number
  supertype:  #number  a concept of quantity derived from zero and units; "every number has a unique position in the sequence"
  subtype:  #square_root  a number that when multiplied by itself equals a given number
  subtype:  #cube_root  a number that when multiplied three times equals a given number

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