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In this Wednesday, Oct. 11, 2017 file photo, Arizona Cardinals quarterback Carson Palmer answers a question during a news conference after practice at the team facility in Tempe. Palmer is retiring after 15 NFL seasons. Palmer, who turned 38 last week, made the announcement in an open letter released by the Cardinals on Tuesday, Jan. 2, 2018. (Ross D. Franklin/AP, File)

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PHOENIX — Coach Bruce Arians once said he and quarterback Carson Palmer would ride away into the sunset together like a pair of old desert cowboys.