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On the left, estimation of edge lengths ℓ(ar|abc), ℓ(br|abc) and ℓ(cr|abc) of the triplet tree {a, b, c}. On the right, estimation of path length ℓ(s0r|s0s1s2) and edge lengths ℓ(r1r|s0s1s2), ℓ(r2r|s0s1s2) based on the triplet tree {s0, s1, s2}.
