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TORONTO, July 21 (Reuters) - Toronto's main stock index rose at the open on Tuesday as higher oil and metal prices and investor optimism about this quarter's earnings boosted the resource-heavy index to its highest level in six weeks.
The S&P/TSX composite index .GSPTSE rose 43.88 points, or 0.42 percent, to 10,584.59 at the open. Nine of the TSX's 10 subindexes were higher, led by a 1.09 percent rally in the energy group. (Reporting by Nina Lex; editing by Peter Galloway)