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Balanced Quatrefoil Decomposition of Complete Multigraphs SUMMARY We
show that the necessary and sufficient condition for the existence of a balanced quatrefoil decomposition of the complete multigraph λKn is n ≥ 9andλ(n − 1) ≡ 0 (mod 24). Decomposition algorithms are also given. key words: balanced quatrefoil decomposition, complete multigraph 1