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UPDATE 2-Emerging market turmoil boosts safe-haven euro zone debt, Italy suffers


* Risk aversion grips world markets amid EM turmoil * German, U.S. bond yields at 3-week lows * Italy's bond yields push higher (Updates with more detail, comment, charts) By Dhara Ranasinghe LONDON, Aug 10 (Reuters) - Most euro zone bond yields fell on Friday, with German borrowing costs at three-week