GRE Text Completion Question 2593

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Source: 2014

Researchers trying to make it possible to trace counterfeit documents to the printer that produced them are (i) _____ the fact that the rotating drums and mirrors inside laser printers are imperfect devices that leave unique patterns of banding in their output. Although these patterns are (ii) _____ to the naked eye, they can be (iii) _____ and analyzed by computer programs that the researchers have spent the past year devising.

Blank(i)Blank(ii)Blank(iii)
A exploiting D invisible G detected
B facing E obvious H implemented
C manipulating F unappealing I generated

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