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Arkush: Positional battles ratchet up in preseason opener

Chicago Bears head coach Marc Trestman during NFL football training camp at Soldier Field in Chicago, Saturday Aug. 3, 2013. (AP Photo/Andrew A. Nelles)
Chicago Bears head coach Marc Trestman during NFL football training camp at Soldier Field in Chicago, Saturday Aug. 3, 2013. (AP Photo/Andrew A. Nelles)