By John Tilak TORONTO (Reuters) - Canada's main stock index advanced in choppy trading on Friday, recovering slightly from a sharp selloff in the previous session, led by gains in shares of Bombardier Inc and BlackBerry. Bombardier jumped 4.3 percent after saying that aircraft leasing company Macquarie AirFinance had signed an agreement to buy 40 of its new CSeries jets, with an option for 10 more. BlackBerry shot up 8.7 percent after the company reported a much smaller-than-expected quarterly loss and said it was concentrating on growth and investments. ...



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