#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
  part:  #rundle
  subtype:  #extension_ladder__extensionladder  a ladder whose length can be extended
     subtype:  #aerial_ladder  mechanically extendible ladder; used on a fire truck
  subtype:  #jack_ladder__Jacob's_ladder__pilot_ladder__pilotladder  (nautical) a hanging ladder of ropes or chains supporting wooden or metal rungs or steps
  subtype:  #monkey_ladder  a light ladder to the monkey bridge on a ship
  subtype:  #rope_ladder  a ladder with side pieces of rope
  subtype:  #scaling_ladder__scalingladder  a ladder used to scale the walls in an attack
  subtype:  #sea_ladder__sealadder__sea_steps__seastep  (nautical) ladder to be lowered over a ship's side for coming aboard
     subtype:  #accommodation_ladder__accommodationladder  (nautical) a portable ladder hung over the side of a vessel to give access to small boats alongside
  subtype:  #step_ladder__stepladder  a folding portable ladder hinged at the top

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