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The character 熟 evolved from ancient forms depicting cooking or ripening processes. It combines 孰 (cooking food until done) with 灬 (fire) at the bottom, emphasizing the concept of thorough cooking or complete maturation. Originally meaning 'well-cooked' or 'ripe,' it extended metaphorically to mean 'familiar' (through repeated exposure until 'done'), 'skilled' (thoroughly practiced), and 'deep' (as in deep sleep). The character represents the transformation from raw to cooked, unripe to ripe, or unfamiliar to familiar through a complete process. Arrived in Japan: The character 熟 likely arrived in Japan during the 5th-6th centuries CE along with the broader introduction of Chinese writing system (kanji) through Korean scholars and Buddhist texts, becoming established during the Asuka and Nara periods when Japan systematically adopted Chinese characters and cultural elements.