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The euro climbed to a four-year peak against the yen and rose for a second straight day versus the dollar on Friday.
The dollar jumped to its highest in more than four months against the yen on Thursday.
The dollar edged lower after Fed Chairman Ben Bernanke said the Fed will maintain its ultra-easy policy for as long as needed.
The dollar edged lower in choppy trading after the Chinese central bank said it would gradually exit from regular intervention in the foreign exchange market.
The safe-haven dollar and yen fell on Monday after China announced its most sweeping economic and social reforms in nearly three decades.
The dollar rose against the euro on Wednesday in a lackluster session with investors continuing to trade on comments from a member of the Federal Reserve that seemed to keep the door open to a first drawdown in stimulus next month.
The dollar eased on Wednesday but still clung near a two-month high against the yen, supported by speculation that the U.S. Federal Reserve is on course to start reducing its stimulus as early as December.
The dollar rose broadly, hitting a one-month peak against the yen on Tuesday on higher U.S. bond yields.
The dollar paused in its advance against the euro on Monday after two days of strong gains.
The dollar soared against the euro and yen after data showing U.S. job growth unexpectedly accelerated in October.
The euro fell to a more than seven-week low against the dollar after the European Central Bank shocked investors by cutting interest rates.
The euro rose as stronger-than-expected German industry data increased uncertainty over whether the ECB would cut interest rates this week.
The euro fell on Tuesday, hit by speculation the European Central Bank may signal easier monetary policy.
The euro touched a six-week low on Monday after suffering its biggest drop in over a year last week as pressure mounted on the European Central Bank to cut interest rates to shore up growth.
The dollar hovered near a two-week high on Thursday as some investors cut negative bets on the currency.
The dollar turned positive against a basket of major world currencies in thin trade on Wednesday.
The dollar inched up, but stayed near a nine-month trough as investors bet the Federal Reserve this week will set the course for its massive stimulus program to be maintained.
The dollar edged higher on Monday but held close to a nine-month low against a basket of currencies.
The euro hovered close to a two-year high against the dollar on Friday.
The euro was steady against the dollar on Thursday after disappointing euro zone data drew it away from a two-year high.