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Is the average native Japanese speaker likely to have heard of Hepburn romaji? Not necessarily being able to recall the entire kana table, but at least knowing that it is a romanization system which has some kana different from other systems?
It's called ヘボン式ローマ字. 訓令式ローマ字 is taught in school but I think many Japanese know ヘボン式ローマ字.
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