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TORONTO, Aug 18 (Reuters) - Canada's main stock index slipped on Tuesday, with railways and miners leading a broad retreat as copper hit a six-year low and Chinese equities tumbled.
The Toronto Stock Exchange's S&P/TSX composite index unofficially ended down 57.66 points, or 0.40 percent, at 14,193.87. That was its seventh fall in nine sessions. (Reporting by Alastair Sharp; Editing by Nick Zieminski)