#particular_date  a particular day specified as the time something will happen; "the date of the election is set by law"
  supertype:  #particular_day__day  a day assigned to a particular purpose or observance; "Mother's Day"
  subtype:  #rain_date  an alternative date set for some outdoor event in case it rains on the appointed date; "the rain date for the picnic will be the following Sunday"

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