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Fuels (Rbf)

Computer viruses ()
Materials (R)
    Classes of materials (Rb)
        States of matter (Rbb)
        Chemicals (Rbc)
        Water (Rbd)
        Natural earth crust materials (Rbe)
        Fuels (Rbf)
            Fuel composition (Rbfc)
            Alcohol fuels (Rbfd)
            Biomass fuels (Rbfe)
                 Use For: Biofuels; Biogas
            Fossil fuels (Rbff)
            Hydrogen fuels (Rbfh)
            Nuclear fuels (Rbfn)
            Fuels by properties (Rbfp)
            Fuels by end use (Rbfu)
        Air (Rbj)
        Building materials (Rbm)
             Use For: Construction materials
             Related Term (Associative): Equipment (Qt)