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BRIEF-S&P 500 to add PetSmart, drop Sunoco

Oct 1 (Reuters) -

* S&P says PetSmart Inc to replace Sunoco Inc in S&P 500

* S&P says change to be made after close of trading on October 4

* S&P says Sunoco being acquired by Energy Transfer Partners LP

((New York Equities Desk; tel: +1 646 223 6000))