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Alkali metals (Rbcebb)

Materials (R)
    Classes of materials (Rb)
        Chemicals (Rbc)
             Related Term (Associative): 
            Chemical elements (Rbce)
                 Use For: Elements
                Classes of chemical elements (Rbceb)
                    Alkali metals (Rbcebb)
                    Halogens (Rbcebh)
                    Nonmetals (Rbcebn)
                    Trace elements (Rbcebr)
                         Use For: Micronutrients
                    Transuranium elements (Rbcebt)