(Corrects first paragraph to say third session of declines, corrects milestone in second paragraph to lowest since June 28, 2012) By Barani Krishnan NEW YORK, June 26 (Reuters) - Gold tumbled 4 percent on Wednesday for its third straight session of declines, and copper and coffee prices slipped too, pushing a benchmark commodities index to a one-year low. The 19-commodity Thomson Reuters-Jefferies CRB index fell 0.4 percent...
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