#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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