 the interval [0,n-1], with IDs [0,a] on process 0, IDs [a+1, b] on process 1, IDs [b+1, c] on process 2, etc. <br/>
       FAST_NO_DUP = graph global IDs are in the interval [0,n-1] with IDs [0,a] on process 0, IDs [a+1, b] on process 1, IDs [b+1, c] on process 2, etc., and there are no duplicate edges and no need of symmetrization.<br/>
       See <i>GRAPH_FAST_BUILD_BASE</i> below to allow IDs to that are one-based instead of zero-based.
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