#reign  a period during which something or somebody is dominant or powerful; "he was helpless under the reign of his egotism"
  supertype:  time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  subtype:  reign_of_terror  any period of brutal suppression resembling the French Reign of Terror

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