#time_scale  an arrangement of events used as a measure of duration; "on the geological time scale mankind has existed but for a brief moment"
  supertype:  duration__continuance  the period of time during which something continues
  subtype:  extended_time_scale__slow_time_scale  (in simulation) the time scale used in data processing when the time-scale factor is greater than one
  subtype:  fast_time_scale  (in simulation) the time scale used in data processing when the time-scale factor is less than one

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