#variability__unevennes  a quality of variability and lack of uniformity
  exclusion:  invariability
  supertype:  unregularity__irregularity  not characterized by a fixed principle or rate; at irregular intervals
  subtype:  jaggedness  something irregular like a bump or crack in a smooth surface
  subtype:  patchiness  unevenness in quality or performance
  subtype:  personal_equation  variability attributable to individual differences

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