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Polytomy identification. Part I presents a three-level bifurcation subtree with 4 genome taxa A, B, C and D. X1, X2 and X3are genome distances calculated among A, B and C. And S1, S2, S3, S4and S5are branch lengths. If bifurcating subtree of A, B and C is identified as a polytomy, then the sub-tree can be converted to a multifurcation subtree, shown as Part II.
