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Brazilian bull rider Robson Palermo rides a bull during the Professional Bull Riders World Finals in Las Vegas, Nevada October 30, 2011. Palermo won the Las Vegas event and $250,000.
REUTERS/Las Vegas Sun/Steve Marcus
Groupon's rough ride down Wall StreetShares of Groupon were up more than 7% Tuesday, but the ride since the daily deals start-up went public November 4 has been rough and downhill. Read more.
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