TORONTO, May 16 (Reuters) - Canada's main stock index fell on Friday as sluggish commodity prices weighed on shares of materials companies in low-volume trading ahead of the long weekend. The Toronto Stock Exchange's S&P/TSX composite index was down 74.15 points, or 0.51 percent, at 14,514.74. Nine of the 10 main sectors on the index were in the red. (Reporting by John Tilak)
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