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U.S. stocks extend losses as early rally fades

S&P 500 down 12 percent from record May 21 close

Firms’ outlooks sour investors

Stocks sink on gloomy 2015 views

Stocks plunge on fears about implications of oil slump

European worries add to broad sell-off

Big slump is no cause to ditch stock market

Pros say corporate earnings, strengthening U.S. economy help equities