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(Reuters)
TORONTO (Reuters) - Toronto's main stock index fell on Monday morning, dragged lower by a downgrade to Research in Motion , but strength in resource issues limited the drop.
Citigroup cut its rating on the BlackBerry maker's stock to "sell" from "buy".
The S&P/TSX composite index was down 22.81 points, or 0.21 percent, at 10,887.94 at the open.
(Reporting by Ka Yan Ng; editing by Peter Galloway)



