#missive__letter  a written message addressed to a person or organization; "wrote an indignant letter to the editor"
  supertype:  textual_matter__textualmatter__text  the words of something written; "there were more than a thousand words of text"; "they handed out the printed text of the mayor's speech"; "he wants to reconstruct the original text"
  part:  postscript  name_and_address
  part of:  mail  correspondence
  subtype:  business_letter  a letter dealing with business
  subtype:  covering_letter__cover_letter__coverletter  a letter sent along with other documents to provide additional information
  subtype:  crank_letter__crankletter  a hostile (usually anonymous) letter
  subtype:  encyclical_letter__encyclical  a letter from the pope sent to all Roman Catholic bishops throughout the world
  subtype:  personal_letter  a letter dealing with personal affairs
     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
  subtype:  form_letter  a letter that is printed in multiple copies and mailed to a list of recipients
  subtype:  open_letter  a letter of protest; addressed to one person but intended for the general public
  subtype:  chain_letter__chainletter  a letter that is sent successively to several people
  subtype:  pastoral.missive  a letter from a pastor to the congregation
  subtype:  round_robin  a letter signed by a number of people
  subtype:  airmail_letter__airmailletter__air_letter__airletter__aerogram__aerogramme  a letter sent by air mail
  subtype:  epistle  especially a long, formal letter
  subtype:  dead_letter  a letter that can neither be delivered nor returned
  subtype:  letter_of_intent  any letter expressing an intention to take (or forgo) some action
     subtype:  investment_letter  a letter of intent saying that a letter security is being bought for investment and not for resale; avoids need for SEC registration

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