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PHOENIX -- Heated competition has cast Jim Harbaugh and Pete Carroll as bitter enemies, first in the Pacific-10 Conference and now in the NFC West.The heat sources at the Arizona Biltmore resort, site of the ongoing NFL owners meeting, are much less threatening. There are fire pits on the patio for when the temperature dips slightly. But as the presence of palm trees suggest, there's no shortage of natural warmth."Resort casual" bears no resemblance to the frenzied stadiums where Harbaugh's San Francisco 49ers and Carroll's Seattle Seahawks will help settle the NFC West race in the fall and winter.