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NEW YORK — After Tyson Chandler and Kenyon Martin fouled out of Game 6 against the Indiana Pacers, a third-string center was needed to match up against Roy Hibbert. Mike Woodson had two at his disposal, Marcus Camby and Amar’e Stoudemire, — or three if you count Earl Barron, who was signed as an insurance policy in case the Knicks needed a center at a moment of desperation. But the call went to rookie Chris Copeland, who turned out to be a