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. 2016 Jul 23;9(8):613. doi: 10.3390/ma9080613

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© 2016 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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Free-body diagrams of struts (a) AB in deformation $q_{1} = 1$ ; (b) AB in deformation $q_{2} = 1$ ; and (c) BC in deformation $q_{2} = 1$ of the hexagonal honeycomb unit cell.