#degree.exponent  the highest power of a term or variable
  supertype:  #exponent.mathematical_notation__power__index  a mathematical notation indicating the number of times a quantity is multiplied by itself
  subtype:  #degree_of_a_term  the sum of the exponents of the variables in the term
  subtype:  #degree_of_a_polynomial  the degree of the term in the polynomial that has the highest degree

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