#ladder  steps consisting of two parallel members connected by rungs; for climbing up or down
  supertype:  #stairway__staircase__stairs__steps__step  a way of access consisting of a set of steps
  subtype:  #extension_ladder  #jack_ladder  #monkey_ladder  #rope_ladder  #scaling_ladder  #sea_ladder  #step_ladder
  part:  #rundle__spoke  one of the crosspieces that form the steps of a ladder

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