#arrow.mark__pointer  a mark to indicate a direction or relation
  supertype:  #mark.written_symbol  a written or printed symbol (as for punctuation); "his answer was just a punctuation mark"
  part:  #shaft  a line that forms the length of an arrow pointer
  part:  #point.mark__head  a V-shaped mark at one end of an arrow pointer; "the point of the arrow was due north"

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