prov:value
| - wherein M is an alkali or alkaline earth metal, copper, zinc, boron, aluminum, silicon, titanium, zirconium, vanadium, chromium, molybdenum, tungsten, uranium, iron, cobalt, or nickel, A is an electronegative element or --O--, --OH, or --OR, wherein R is alkyl or aryl, and x and y are integers of 1 to 2 and 1 to 5 respectively.
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