FAYETTEVILLE -- Here's a little primer on the Arkansas Razorbacks' offense heading into their season opener Saturday against Alabama A&M.

The "knowns" are few, but they are strong for second-year coordinator Bobby Petrino, who has scripted and produced record-breaking numbers in his previous five seasons running the Arkansas offense, including four as head coach from 2008-11. Second-year transfer quarterback Taylen Green and right tackle E'Marion Harris are the only players returning as starters at the same positions they played last season. Projected left guard Fernando Carmona is also a returning 13-game starter, but he logged that time at left tackle last season.

Beyond that, tailback Braylen Russell, tight ends Andreas Paaske and Maddox Lassiter, as well as receivers CJ Brown and Mon

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