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The yen weakened against the dollar, falling 0.3 percent to 92.97 at 8:43 a.m. London time.
The Japanese currency also slid against the euro, declining 0.4 percent to 124.31.
To contact the reporter on this story: Lucy Meakin in London at lmeakin1@bloomberg.net
To contact the editor responsible for this story: Paul Dobson at pdobson2@bloomberg.net