#stairway__staircase__stairs__steps__step  a way of access consisting of a set of steps
  supertype:  #way  any artifact consisting of a road or path affording passage from one place to another; "he said he was looking for the way out"
  subtype:  #backstairs  #companionway  #escalator  #fire_escape  #flight_of_stairs  #ghat  #ladder
  part:  #landing.platform  #stairhead  #stair
  part of:  #edifice__building  a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"

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