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The task of generating an evolutionary unbiased score for a MSA
can be rephrased as a simple problem: How can a tree be traversed,
going from leaf to leaf, such that all edges (each representing
its own episode of evolutionary divergence) are counted the same
number of times? Assume that a tree contains 5 leaves, labeled
from A to E.

*Chantal Korostensky*

*1999-07-14*