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Air (Rbj)

Materials (R)
    Classes of materials (Rb)
        States of matter (Rbb)
        Chemicals (Rbc)
        Water (Rbd)
        Natural earth crust materials (Rbe)
        Fuels (Rbf)
        Air (Rbj)
            Compressed air (Rbjc)
        Building materials (Rbm)
             Use For: Construction materials
             Related Term (Associative): Equipment (Qt)