#personal_letter  a letter dealing with personal affairs
  supertype:  missive__letter  a written message addressed to a person or organization; "wrote an indignant letter to the editor"
  subtype:  short_letter__shortletter__note__line  a short personal letter; "drop me a line when you get there"
  subtype:  love_letter__billet_doux  a personal letter to a loved one expressing affection

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