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The Dow gained 143 points to end at 11153. Traders worried about Europe's debt problems were relieved that Germany passed a measure to expand the powers of a regional bailout fund.
The Dow closed 43 points lower, the S&P 500 gained just one point, and the Nasdaq rose 24 points on Friday. For the week, each index was up.
Stocks weighed down by Washington debt-limit talks, mixed corporate earnings. Stocks in Europe lifted by second Greek bailout.