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. 2019 Mar 24;21(3):319. doi: 10.3390/e21030319

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© 2019 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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A new cube K constructed by $L_{1}$ , $L_{2}$ , $L_{3}$ . $K_{1}$ , $K_{2}$ and $K_{3}$ are the 1st, 2nd and 3rd squares of K respectively.