| http://www.w3.org/ns/prov#value | - Suitable strong bases are in particular the alkali metals themselves such as lithium, sodium or potassium, or alkali metal amides such lithium amide, sodium amide or potassium amide, or alkali metal hydrides such as lithium, sodium or potassium hydride, or alkaline earth metal alcoholates or alkali metal alcoholates which are derived preferably from primary, secondary or tertiary aliphatic alcohol
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