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Depending on how the bandwidth is available to the 100BT ports , this has enough bisection bandwidth to run 12 full duplex pairs both ways . This might be called " Duplex Printing " , " 2-sided Printing " or " Double-Sided Printing " . Duplex printing aclps and gclps can print on both sides of the paper . The default configuration supports '' Automatic Duplex Printing '' , which automatically prints on the front and back sides of paper , enabling easy double-sided printing for both plain paper and double-sided photo paper . There is a box on this tab in which you can choose duplex printing options . Duplex polypyrrole ( PPy ) films have been electrochemically synthesized on iron to be used as protective coatings against corrosion . To this painful recognition of familiar places , was added a feeling experienced by all , understood by none - - a feeling as if in some state , less visionary than a dream , in some past real existence , I had seen all I saw , with precisely the same feelings as I now beheld them - - as if all my sensations were a duplex mirror of a former revelation . Instructions for Cards : Use the duplex function on your photocopied and card stock paper if available . Everyone is encouraged to use both sides of the page when printing ( duplex printing ) .