TORONTO, May 23 (Reuters) - Canada's main stock index was little changed on Friday as shares of energy producers received a boost from higher oil prices, offsetting a decline in the materials sector. The Toronto Stock Exchange's S&P/TSX composite index unofficially closed up 5.81 points, or 0.04 percent, at 14,708.10. Seven of the 10 main sectors on the index were higher. (Reporting by John Tilak; Editing by Meredith Mazzilli)
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