#drop.depository  a central depository where things can be left or picked up
  supertype:  #depository__deposit__repository  a facility where things can be deposited for safekeeping
  subtype:  #maildrop  a drop where mail can be deposited
     subtype:  #postbox__mailbox__letter_box  public box for deposit of mail
        subtype:  #pillar_box  (British) a red pillar-shaped letter box

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