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. 2022 Jun 21;84(8):76. doi: 10.1007/s11538-022-01037-z

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — A non-binary orchard network on ${a, b}$ that does not admit a labelling on the nodes that adheres to the ‘reticulations have the same labels as all but one of its parents’ rule. Indeed, under this rule, exactly two of $t_{1}, t_{2}, t_{3}$ must have the same label, but no labelling can satisfy this rule. Therefore, this labelling rule does not fully characterize the class of non-binary orchard networks