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Variable tolls (Bbktv)

Computer viruses ()
Transportation operations (B)
     Related Term (Associative): Management and organization (C)
    Freight and passenger services (Bb)
        Rates, fares and tolls (Bbk)
            Tolls (Bbkt)
                 Related Term (Associative): Road pricing (Cfspr)
                Shadow tolls (Bbkts)
                Variable tolls (Bbktv)