US STOCKS-Wall St on track for fourth day of gains, FedEx jumps

* FedEx up 7 pct, one of day’s biggest gainers * Tesla climbs on news it will be added to Nasdaq 100 index * Dow up 0.6 pct, S&P 500 up 0.8 pct, Nasdaq up 0.6 pct By Leah Schnurr NEW YORK, July 9 (Reuters) …

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