<P> Consumer and low - to - medium volume office printers use a duplexing unit that reverses a piece of paper after the first side has been printed . Duplex multifunction printers that also support duplex scanning have a reversing automatic document feeder (RADF) for scanning both sides . Higher volume printers may effectively have two print engines in a single device, and are able to print both sides of the paper in a single pass . </P> <P> Duplex print devices, depending on options, software, and printer settings, can print single - sided page to single - sided page (1: 1) or double - sided page to double - sided page (2: 2). Many can also combine single - sided pages into a double - sided page format (1: 2). Double - sided booklet formats (2: 2 with a center fold) are also available, depending on optional outputs from the printer . </P> <P> Duplexed documents can be printed to be bound on either the short edge or the long edge . This functionality is mostly available on printers that come with a duplexer . Long edge binding in portrait mode allows pages to be turned side - to - side like a book . Short - edge binding allows the pages to be oriented correctly if they are flipped vertically, as in a notepad . This second form of printing / binding is sometimes known as "tumble ." If the printing is done in landscape mode, these concepts are transposed since the print direction is different . </P> <P> Single - sided printers can print both sides of the paper by manually removing and turning over a stack of sheets after one side is printed; however, the user has to manually turn the print job over and re-initialize the printing of the document, with care to ensure that the order and orientation is correct . </P>

What does flip it and tumble it mean
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