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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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Elongation occurs as the first step which is chosen randomly between the edges incident to the origin (compare Fig. 3). Here the chosen edge to reach is shown in green. Selection of vertices incident to the walk from the side correspond to the expansion. The vertices selected to be merged with are shown in grey. Contraction of the selected vertices and its result after merging the selected vertices to . Another step, including elongation and expansion, is shown as a second step on the lattice. The second step reaching uses the same color schema as before.

Inline graphic — Elongation occurs as the first step which is chosen randomly between the edges incident to the origin (compare Fig. 3). Here the chosen edge to reach is shown in green. Selection of vertices incident to the walk from the side correspond to the expansion. The vertices selected to be merged with are shown in grey. Contraction of the selected vertices and its result after merging the selected vertices to . Another step, including elongation and expansion, is shown as a second step on the lattice. The second step reaching uses the same color schema as before.