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In page Codex:

"

Traditional bookbinders would call one of these assembled, trimmed and bound folios (that is, the "pages" of the book as a whole, comprising the front matter and contents) a codex in contradistinction to the cover or case, producing the format of book now colloquially known as a hardcover. In the hardcover bookbinding process, the procedure of binding the codex is very different to that of producing and attaching the case.[citation needed]