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AutoNation to join S&P 500 Index

NEW YORK, Feb 19 (Reuters) - AutoNation Inc. , the largest U.S. car dealer chain, will replace Rational Software Corp. in the S&P 500 Index after the close of trading on a date yet to be announced, Standard & Poor's said on Wednesday.

Rational Software, which makes development tools for building software programs, has agreed to be acquired by International Business Machines Corp. , an S&P 500 Index component. The transaction is still subject to approval by the European Union.