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TORONTO, March 29 (Reuters) - Toronto's main stock index declined shortly after the open on Tuesday as mining and energy shares fell, mirroring commodity prices.
The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE was down 9.2 points at 13,883.53.
Six of its 10 main groups were in negative territory.
($1=$0.98 Canadian) (Reporting by Solarina Ho; editing by Peter Galloway)