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. 2014 Jan 22;9(1):e85585. doi: 10.1371/journal.pone.0085585

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© 2014 Bucksch et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Left: The fiber (green) on a lattice and its edges selected for contraction. Right: The contracted edges which are possible follow up steps of length 1, and 2. In both figures the edge labels involved in the contraction and their direction, indicated as arrows are shown.

Inline graphic — Left: The fiber (green) on a lattice and its edges selected for contraction. Right: The contracted edges which are possible follow up steps of length 1, and 2. In both figures the edge labels involved in the contraction and their direction, indicated as arrows are shown.