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49ers: Defensive end Arik Armstead, who enters his fifth NFL season after being a first-round draft pick, talks about his role in the team's defense and his off-field interests, including his Sacramento-based foundation.
49ers: Defensive end Arik Armstead, who enters his fifth NFL season after being a first-round draft pick, talks about his role in the team's defense and his off-field interests, including his Sacramento-based foundation.