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Watch: Former Oregon Ducks star Arik Armstead posts second straight game with a sack for San Francisco 49ers - oregonlive.com
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49ers final injury report: Arik Armstead is officially questionable against the Broncos; Kittle is 'good to go' - Niners Nation
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Watch: Former Oregon Duck Arik Armstead remains a red-hot sack machine for the undefeated San Francisco 49ers - oregonlive.com
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