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. 2020 Aug 26;11:4257. doi: 10.1038/s41467-020-18116-1

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© The Author(s) 2020

Open Access This 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — a Cyclic reversible actuation of a non-isomerized material under a constant stress (0.8 MPa). b The relationship between reversible strain and the external stress. c Schematic illustration of reversible shape memory process. d Reversible shape transformations obtained by patterned isomerization with the corresponding light patterns shown as the insets (light irradiation time: 300 s). e Schematic illustration of the triple-shape memory process. f The original shape and 2^nd temporary shape in the triple-shape memory cycles, with the corresponding light patterns shown as the insets (light irradiation time: 300 s). (All scale bars: 10 mm).