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When the medieval scribe had finished his work, he or another scribe usually went through the entire manuscript to make sure he had made no mistakes. He did so while comparing his work to the exemplar, the book he had copied his text from. Mistakes he encountered would be erased
When it became apparent that he had skipped a word or even a whole sentence or paragraph, he could simply amend it by copying the omitted text nearby. In this image the scribe indicates that the omitted word tota needs to be inserted into the text. He did so by placing it right over its proper location, after the word ut. Readers would also insert missing words themselves, if the scribe had failed to do so.