US STOCKS-S&P 500, Nasdaq advance as soft inflation tempers Fed rate-hike bets

* Indexes: Dow down 0.06%, S&P 500 up 0.59%, Nasdaq up 1.1% * August PCE at +0.3% month-on-month vs +0.4% est. * S&P 500, Nasdaq set for second straight quarterly gain * Moderna slips after Citigroup

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