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TORONTO, Dec 7 (Reuters) - Canada's main stock index suffered its biggest one-day loss in 10 weeks on Monday, as energy stocks declined in line with sharp losses for crude oil after the OPEC producer group failed to address a growing supply glut.
The Toronto Stock Exchange's S&P/TSX composite index unofficially closed down 315.94 points, or 2.37 percent, at 13,042.83. The energy group sank 5.9 percent. (Reporting by Alastair Sharp; Editing by Cynthia Osterman)