#postscript__PS  a note appended to a letter after the signature
  supertype:  #annotation__note__notation  a comment (usually added to a text); "his notes were appended at the end of the article"
  part of:  #missive__letter  a written message addressed to a person or organization; "wrote an indignant letter to the editor"
     part of:  #mail  the bags of letters and packages that are transported by the postal service
     part of:  #correspondence  communication by the exchange of letters

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