Thu May 17, 2012 4:43pm EDT * Worries about Greece euro exit, banking sector hurt euro * Euro hits 4-month low vs firmer dollar, 3-month low vs yen * Spain’s Bankia shares tumble, talk of possible downgrades By Gertrude Chavez-Dreyfuss NEW YORK, May 17 (Reuters) – The safe-haven yen posted sharp gains against the...
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