#calendar_day__civil_day__civilday  a day reckoned from midnight to midnight
  supertype:  #time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  subtype:  #particular_day  #day_of_the_week
  part of:  #week__hebdomad  any period of seven consecutive days; "it rained for a week"

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