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an original copy on vellum (Hubay index #35) in the U. S. Library of Congress shows that Gutenberg's movable type was set justified in a uniform style, 42 equal lines per page. The Gutenberg printing press required words composed of individual movable type to be secured within a rigid, nonprinting frame. To ensure each line fit the frame uniformly, Gutenberg addressed differences in line length by inserting a hyphen at the end of a line at the right-hand margin. This

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