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Stocks flatlined and the dollar dipped on Tuesday as caution set in before testimony from Federal Reserve chief Janet Yellen that may offer clues to the timing of the next U.S. interest rate rise. Adding to pressure on the dollar was the resignation of President Donald Trump's national security adviser Michael Flynn, who quit over revelations he had discussed U.S. sanctions against Moscow with the Russian ambassador to the United States before Trump took office, and misled Vice President Mike Pence about the conversations.
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