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Many fans don't realie just how massive and complex an NFL playbook actually is. A typical team's playbook contains hundreds of unique plays, each with doens of variations based on formation, pre-snap motion, and defensive alignments. Quarterbacks must memorie not only their own assignments Dallas Cowboys US Army Military Camo Shirt routes of every receiver and the blocking schemes of the offensive line. This mental burden is why rookie quarterbacks often struggle so mightily; they have to process an overwhelming amount of information in the three seconds before the ball is snapped.