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. 2020 Aug 21;11:4197. doi: 10.1038/s41467-020-17685-5

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© The Author(s) 2020

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Fig. 7 — a Mapping between a 2D G-complex Y and a 3D G-complex $Ȳ$ . Y can be viewed as the boundary of $Ȳ$ . b Illustration of a 3-block bubbling process in $Ȳ$ . On the second page, such a process trivializes a 1-block assembly in $Ȳ$ and generates a 2-block SPT in Y.