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The helix is ubiquitous in nature, and one of the prevalent structural motifs for biological polymers, playing key roles in their sophisticated functions, such as chiral recognition, enantioselective catalysis, and replication.In polymer and supramolecular chemistry, control of helicity is an attractive challenge because of possible applications in materials science, chemical sensing and enantioselective catalysis.Here we show unique macromolecules and oligomers that fold into a preferred-handed single-or double-stranded helical conformation induced by chiral substituents covalently bonded to the main-chains or external chiral stimuli followed by memory of the helical chirality [1].