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. 2023 Sep 26;14:6004. doi: 10.1038/s41467-023-41679-8

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© The Author(s) 2023, corrected publication 2023

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Fig. 1 — a Progression and future of mechanical metamaterials within and beyond the mechanical functionalities and toward achieving a level of cognition and autonomy. b Maturity level of mechanical metamaterials with the development trend leading to cognitive integrated mechanical metamaterial systems.