Stock index futures briefly trimmed losses on Friday after government data showed U.S. retail sales rose more than expected in April, boosted by a surprise gain in motor vehicle sales.

S&P 500 futures fell 10.2 points and were below fair value, a formula that evaluates pricing by taking into account interest rates, dividends and time to expiration on the contract. Dow Jones industrial average futures dropped 97 points, and Nasdaq 100 futures lost 19 points.

(Reporting by Chuck Mikolajczak; editing by Jeffrey Benkoe)

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