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Structures are represented by strings s of 0s and 1s, according to whether a site is on the surface or in the core, respectively. Shown are two examples of compact 6 × 6 lattice structures. (a) A typical structure. Dotted lines indicate local changes that can be performed to transform it to other compact structures. Note that the change at the lower right corner does not change the string pattern, so this structure is a degenerate one. (b) The most designable structure.
