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BlackBerry’s stock opened up more than 40 per cent on Monday morning, building on a burst of trading that has seen the Waterloo, Ont.-headquartered firm’s share price nearly triple this year. The smartphone pioneer turned security-software maker didn’t make any particularly notable announcements over the weekend. Its rise on the New York and Toronto stock exchanges instead seems to be driven by the same market exuberance that’s revived the stock of GameStop.