#rail_fence  a fence (usually made of split logs laid across each other at an angle)
  supertype:  #fencing__fence  a barrier that serves to enclose an area
  subtype:  #worm_fence  rail fence consisting of a zigzag of interlocking rails
  part:  #split_rail__splitrail__fence_rail__fencerail  a rail that is split from a log

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