By Barani Krishnan NEW YORK, June 26 (Reuters) - Gold tumbled 4 percent on Wednesday for its fourth 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 to its lowest levels since June 29, 2012, even though oil prices rose, tracking the stock market's rally....
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