By Alastair Sharp TORONTO (Reuters) - Canada's main stock index edged higher on Tuesday after a seven-day streak of losses as investors picked through earnings reports and several resource stocks got a bounce from recent lows. BlackBerry Ltd gained 4.8 percent to C$9.96 after Morgan Stanley upgraded the stock of the smartphone pioneer. Shares in oil company Husky Energy Inc jumped 3.4 percent to C$23.34 after its quarterly report.



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