| http://www.w3.org/ns/prov#value | - You can often get away with things like the STL, but often, such as in this case, you need more information than what the standard implementations give you. (in this case, you need either the index of an equivalent vertex already in there or the index for the vertex you just inserted) In order to do that, you need to have a custom implementation. (just whether there was an equivalent one or not)
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