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Trailer on flat car (Bbbadt)

Computer viruses ()
Transportation operations (B)
     Related Term (Associative): Management and organization (C)
    Freight and passenger services (Bb)
        Freight service (Bbb)
            Intermodal services (Bbba)
                Piggyback transportation (Bbbad)
                    Trailer on flat car (Bbbadt)
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