| http://www.w3.org/ns/prov#value | - A preferred base is selected from, for example, but not limited to: an alkali or alkaline earth metal hydroxide, alkoxide, carbonate, halide or hydride, such as sodium hydroxide, potassium hydroxide, sodium methoxide, sodium ethoxide, potassium tert- butoxide, sodium carbonate, potassium carbonate, potassium fluoride, sodium hydride or potassium
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