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Comment: 15 pages, accepted to Geometriae Dedicata, omitted the comment about
the potential function in rank 2 being equal to injrad (because it was false).
M. Bridson, und K. Vogtmann. (2010)cite arxiv:1007.2598
Comment: Incorrect Lemma (2.5) replaced by new Proposition 2.5. Typos
corrected, references updated.
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