CMS Forex - The dollar fell versus the euro and pound but rose against the yen on Tuesday. Risk appetite returned to the FX market after Warren Buffett, chairman of Berkshire Hathaway Inc., said he offered to reinsure $800 billion of municipal liabilities. The yen fell on renewed carry-trade interest as Buffett's offer boosted US equities. The dollar block currencies and Swiss franc were little changed. Sterling gained after UK inflation rose slightly more than expected.