Input (grade 10): In the U.S. Bureau of Engraving and Printing, more than one hand engraver will work on the same plate, making it nearly impossible for one person to duplicate all the engraving on a particular banknote or document.
Output (grade 9): In the U.S. Bureau of Engraving and Printing, more than one engraver will work on the same printing plate, making it nearly impossible for any person to duplicate all the engraving on almost any banknote or document.