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. 2016 Sep 29;17:400. doi: 10.1186/s12859-016-1258-4

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Computing the upper bound on a sequence graph. Note the existence of a perfect component connecting segment C to the rest of the sequence graph, containing nodes n ₃, n ₄, n ₅ and n ₆. In total, we obtain S=3, I=0, l=1, hence an upper bound of 2