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* Trade optimism fades; all major S&P sectors fall

* Healthcare stocks lead declines

* U.S. Dec. construction spending unexpectedly falls

* S&P 500 seeing resistance at 2,800-pt mark – analyst

* Indexes down: Dow 1.38 pct, S&P 1.07 pct, Nasdaq 0.94 pct (Updates prices to afternoon)

By Medha Singh and Amy Caren Daniel

March 4 (Reuters) –

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