#wave_number  the reciprocal of the wavelength of a wave
  supertype:  #frequency__frequence__oftenness__oftennes  the number of occurrences within a given time period (usually 1 second); "the frequency of modulation was 40 cycles per second"
  subtype:  #rydberg_constant__rydbergconstant__rydberg__rydberg_unit__rydbergunit  a wave number characteristic of the wave spectrum of each element

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