Identification of a particular Bible as belonging to a specific edition is complicated by the flexibility of the whole production process at the time. The text, being set in movable type, could be corrected or changed in the middle of a print run; thus copies of a given edition may differ on some pages. Also, at the binding stage, a title page from one edition might be combined with text from another edition. The exact origins of a Bible can therefore only be determined by detailed examination of the text. Print runs for early Bibles were relatively short by present-day standards; typically perhaps 1000 to 2500 copies.