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Human powered aircraft (Qbkph)

Computer viruses ()
Vehicles and equipment (Q)
    Vehicles (Qb)
         Related Term (Associative): Computer viruses (); Computer viruses ()
        Aircraft (Qbk)
             Related Term (Associative): Aeronautical engineering (Ttkbb)
            Aircraft by motive power (Qbkp)
                Human powered aircraft (Qbkph)
                Jet propelled aircraft (Qbkpj)
                     Use For: Jet planes
                Propeller driven aircraft (Qbkpp)
                Wind powered aircraft (Qbkpw)