| http://www.w3.org/ns/prov#value | - Preferred L1 and L2 moieties include, by way of example, alkylene, alkenylene, arylene, aralkylene, any of which may be heteroatom-containing and/or substituted, or L1 and/or L2 may be a heteroatom such as O or S, or a substituted heteroatom such as NH, NR (where R is alkyl, aryl, other hydrocarbyl, etc.), or PR; and
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