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Phil Stewart and Matt Spetalnick WASHINGTON Tue April 6, 2010 6:38pm EDT Factboxes Factbox: Key elements of Obama"s new chief strategyTue, April 6 2010Factbox: Reaction to new U.S. chief policyTue, April 6 2010 Related Video Obama boundary make use of nukes Tue, April 6 2010 Countdown to chief pact