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. 2018 Aug 21;20(9):625. doi: 10.3390/e20090625

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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The graph drawings of two simple graphs $G_{1}$ and $G_{2}$ . (a) A simple path graph $G_{1}$ , where there are visually 2 paths between $v_{3}$ and $v_{4}$ . (b) A simple path graph $G_{2}$ , where there are visually 3 paths between $v_{4}$ and $v_{5}$ .