By Ryan Vlastelica NEW YORK (Reuters) - Stocks mostly fell on Monday, extending the previous week's decline as investors found few reasons to buy, though a rally in BlackBerry limited the Nasdaq's decline. The S&P 500 has now dropped for five of the past six sessions, receding from record levels on uncertainty about the Federal Reserve's timing for exiting its stimulus. The index posted its biggest weekly decline since mid-June last week, and is currently about 1.3 percent under an all-time high reached earlier this month. ...



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