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Google lost some of its luster Wednesday as quarterly results failed to meet lofty Wall Street expectations, sending its shares down sharply. Chief executive Larry Page hailed "another great quarter" for Google, with revenue of $15.4 billion, up 19 percent year on year. But Google shares tumbled 2.8 percent in after-hours trade to $540.49. Google remains the world's most important search engine, which generates large amounts of advertising revenues.