prov:value
| - III), Ru(II), V(IV), V(V), Co(II), and Cr(II), Y is an alkali metal or alkaline earth, A is a second anion that may be the same as or different from X and is selected from the group consisting of halide, hydroxide, sulphate, carbonate, cyanate, thiocyanate, isocyanate, isothiocyanate, carboxylate, oxalate, or nitrate, a and b are each integers of 1 or greater, and a, b, and c are selected so as to
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