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TORONTO, April 15 (Reuters) - Toronto's main stock index opened lower on Wednesday as nagging concerns about the global economy forced it to relinquish more of the big gains it has recorded in recent weeks.
The S&P/TSX composite index .GSPTSE fell 23.78 points, or 0.26 percent, to 9,207.84 at the open. Seven of the TSX's 10 sectors were lower. (Reporting by Frank Pingue; editing by Peter Galloway)