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Main lines (Pmudem)

Computer viruses ()
Facilities (P)
     Use For: Complexes; Installations
    Transportation, hydraulic and utility facilities (Pm)
        Railroad facilities (Pmu)
             Related Term (Associative): Railroad tunnels (Pdvtrr); Railroad bridges (Pdybmur)
            Railroad tracks (Pmud)
                 Use For: Tracks
                Lines of track (Pmude)
                    Branch lines (Pmudeb)
                    Main lines (Pmudem)