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Pittsburgh Law Office of Alfred G. Yates Jr., P.C. Files Class Action Lawsuit On Behalf of Shareholders of SandRidge Energy (SD) and Announces Investigations of Ameristar Casinos (ASCA), Arbitron (ARB), Bankrate (RATE), CommonWealth REIT (CWH), Duff & Phelps (DUF), Envivio (ENVI), FirstCity Financial (FCFC), Greenbrier (GBX), Groupon (GRPN), and VeriFone Systems (PAY)

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Alfred Yates, Esq.

Jan 08, 2013, 10:34 EST