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TORONTO, May 1 (Reuters) - Canada's main stock index ended the session marginally lower on Monday, led by a fall in by Pembina Pipeline Corp , which announced it is buying Veresen Inc, and a broad decline in materials stock.
The Toronto Stock Exchange's S&P/TSX composite index fell 10.5 points, or 0.07 percent, to 15,575.63. Four of the index's 10 main groups retreated. (Reporting by Solarina Ho; Editing by Marguerita Choy)