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In page Kana:

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Kana is traditionally said to have been invented by the Buddhist priest Kūkai in the ninth century. Kūkai certainly brought the Siddhaṃ script of India home on his return from China in 806;[citation needed] his interest in the sacred aspects of speech and writing led him to the conclusion that Japanese would be better represented by a phonetic alphabet than by the kanji which had been used up to that point. The modern arrangement of kana reflects that of Siddhaṃ, but the traditional iroha arrangement follows a poem which uses each kana once.