TORONTO (Reuters) - Canada's main stock index advanced for a third straight session on Thursday after positive economic data boosted broad gains across most major sectors and speculation about a potential sale lifted BlackBerry shares. The Toronto Stock Exchange's S&P/TSX composite index was up 14.70 points, or 0.12 percent, at 12,772.51 shortly after the open. (Reporting by John Tilak; Editing by James Dalgleish)



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