#numeration_system__number_system__number_representation_system__system_of_numeration  any notation for the representation of numbers
  supertype:  mathematical_notation  a notation used by mathematicians
  subtype:  positional_notation__positional_representation_system  a numeration system in which a real number is represented by an ordered set of characters where the value of a character depends on its position
     subtype:  pure_binary_numeration_system__binary_numeration_system__binary_number_system__binary_system  a positional system of numeration that uses binary digits and a radix of 2
     subtype:  octal_numeration_system__octal_number_system  a positional system of numeration that uses octal digits and a radix of 8
     subtype:  decimal_numeration_system__decimal_number_system__decimal_system__decimalsystem  a positional system of numeration that uses decimal digits and a base of 10
        subtype:  algorism.decimal_numeration_system  the Arabic (or decimal) system of numeration
     subtype:  hexadecimal_number_system__sexadecimal_number_system__hexadecimal_system__hexadecimalsystem  a positional system of numeration that uses hexadecimal digits and a radix of 16

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