US STOCKS-S&P 500, Nasdaq rise on AI optimism, Micron joins $1 trillion club

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(Updates with afternoon trading levels, adds analyst comments) * Indexes: Dow down 0.35%, S&P 500 up 0.54%, Nasdaq up 1% * Russell 2000 hits intraday record, last up 1.6% * Micron joins $1 trillion

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