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one-line-a-day diary。単一の製品ではなくカテゴリ。現代の参照例は Letts の五年日記(Letts of London は1812年から日付入り日記を印刷している)と Q&A a Day の五年ジャーナル(Potter Style、2010年)。同じ日付の五年分を一つの見開きに重ねるページに、一日一文。引用される研究。通常はなし。