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. 2017 Nov 6;18:468. doi: 10.1186/s12859-017-1882-7

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© The Author(s) 2017

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. 2 — Target RNA secondary structure and assignment events. a This target structure of length N=13 has three base pairs and seven free bases. b After the events {A ₇} and {C G _5,9}, three positions are determined