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The state of Indiana sued tobacco companies, becoming the 22nd state to attempt to recoup money spent treating smoking-related illnesses. . . . The Federal Reserve Board approved rules that will make it easier for banks to offer new products and acquire other financial institutions. . . . UUNet Technologies Inc. said it will spend $300 million this quarter to expand its capability because of surging Internet traffic. . . . USAir Group Inc. said it won’t buy British Airways’ 24.6% stake in USAir, freeing British Airways to sell its holdings and end the companies’ three-year partnership. . . . Snowmobile maker Polaris Industries Inc. said it will begin building motorcycles, riding its small-engine expertise into a market dominated by Harley-Davidson Inc.