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TORONTO, May 18 (Reuters) - Canada's main stock index retreated on Wednesday as mining and energy stocks fell, pressured by lower commodity prices after the U.S. Federal Reserve signaled it could raise interest rates next month.
The Toronto Stock Exchange's S&P/TSX composite index unofficially closed down 91.09 points, or 0.65 percent, at 13,826.01. Five of the index's 10 main groups ended lower. (Reporting by Fergal Smith; Editing by Sandra Maler)