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CheckFree Holdings Corp., a provider of electronic billing and payment services, agreed to buy closely held BlueGill Technologies Inc. for about $250 million in stock. Ann Arbor, Mich.-based BlueGill’s software helps firms convert to electronic billing. . . . Phone.com Inc., a maker of software for linking wireless phones to the Net, agreed to buy @Motion Inc. in a $28-million stock-swap to gain voice-activated browsing capabilities.