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TORONTO, July 23 (Reuters) - Toronto's main stock index was slightly higher at the open on Thursday, boosted by investor optimism about quarterly earnings.
The S&P/TSX composite index .GSPTSE rose 6.43 points, or 0.06 percent, to 10,438.78 at the open. Eight of the TSX's 10 subindexes were higher, led by a 0.91 percent rally in the financial group. (Reporting by Nina Lex; editing by Peter Galloway)