TORONTO, May 20 (Reuters) - Canada's main stock index was little changed on Tuesday as an advance in the materials sector and gains in Valeant Pharmaceuticals International Inc helped offset weakness in some financial shares. The Toronto Stock Exchange's S&P/TSX composite index unofficially closed up 10.45 points, or 0.07 percent, at 14,525.19. Six of the 10 main sectors on the index were higher. (Reporting by John Tilak; Editing by Chizu Nomiyama)
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