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A mixture of two complementary twins, A-b′ and B-a′, assembled into two distinct supramolecular structures. (A) Two complementary twins were able to form a stable tetramer (double-twins) by assembling into a circular structure. (B) Concatemers of alternating twins formed when a twin interacted with two rather than one complementary twin. Reprinted with permission from [43], D. Shu et al., Nano Lett. 4, 1717 (2004). © 2004, American Chemical Society.
