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A 
-partite graph is a Graph whose Vertices can be partitioned
into 
 disjoint sets so that no two vertices within the same set are adjacent.
See also Complete k-Partite Graph, K-Graph
References
Saaty, T. L. and Kainen, P. C.  The Four-Color Problem: Assaults and Conquest.  New York: Dover, p. 12, 1986.