#extreme_point__extremepoint__extreme__extremum  the point located farthest from the middle of something
  supertype:  #extremity.region  the outermost or farthest region or point
  subtype:  #apex__vertex__peak__acme  the highest point of something
     subtype:  #crown  the part of a hat (the vertex) covering the crown of the head
     subtype:  #roof_peak  the highest point of a roof

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