
Are the following mentions coreferent?:
<m> begins </m> in T - Mobile will carry the BlackBerry Q10, business registration begins April 29th, posted
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<m> start </m> in Research in Motion today announced that T-Mobile USA will start selling the new BlackBerry Curve 8900 smartphone to its customers. T-Mobile is expected to launch the BlackBerry Curve 8900 smartphone in mid-February. 