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Stairs (Pbpbls)

Computer viruses ()
Facilities (P)
     Use For: Complexes; Installations
    Structures (Pb)
         Use For: Buildings
        Structural parts (Pbp)
             Related Term (Associative): Equipment (Qt)
            Structural members (Pbpb)
                 Related Term (Associative): Materials by shape or form (Rbmdx)
                Ramps, corridors and stairs (Pbpbl)
                    Corridors (Pbpblc)
                    Ramps (Pbpblr)
                    Stairs (Pbpbls)
                        Half spaces (Building) (Pbpblsh)