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Tunneling (Fcfxt)

Computer viruses ()
Construction and maintenance (F)
     Related Term (Associative): Civil engineering (Ttkf)
    Construction (Fc)
         Related Term (Associative): Computer viruses ()
        Construction of specific facilities (Fcf)
            Excavation and tunneling (Fcfx)
                Excavation (Fcfxe)
                     Use For: Excavating
                Tunneling (Fcfxt)
                     Use For: Jacked box tunneling; Tunnel construction; Tunnelling
                    Cut and cover tunneling (Fcfxtc)
                    Full face tunneling (Fcfxtf)
                    Mucking (Fcfxtm)
                         Use For: Muck removal
                    Shielding (Tunneling) (Fcfxts)
                         Use For: Shield driving