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over 2,000 years ago. Zenodotus, the first librarian at the Alexandrian Mouseion, used the obelus, a symbol placed in the margins to indicate a line found to be spurious. A later librarian, Aristophanes, continued the use of the obelus along with other textual notations like a small star for passages that did not make sense. Aristophanes' student and successor, Aristarchus of Samothrace, introduced

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