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Remarkable developments on living or "controlled/living" radical polymerization have been done over the last couple of decades to produce well-defined polymers with controlled molecular weights,molecular weight distributions (MWDs),and end-functionality.1 Now that living polymerizations have been developed for various monomers,one can access numerous kinds of polymers with tailor-made macromolecular architectures,such as block and graft copolymers.However,since vinyl polymerization of vinyl monomers is implemented as a chain-growth reaction,there are always limitations in control of monomer sequences inherent to the mechanisms.