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青線 [あおせん] /(n) (1) blue line/(n) (2) (See 青線地帯) (hist) (abbr) area around a red-light district where illegal prostitution occurred (marked on police maps by a blue line; 1940s-1956)/(n) (3) non-legal public waterway (denoted by a blue line on cadastral maps; sometimes no longer physically existing)/EntL2829931/