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NYSE to hold 'dry run' for Twitter IPO
A Twitter app on an iPhone screen is shown in this photo, in New York, Friday, Oct. 18, 2013. The New York Stock Exchange isn't taking any chances with Twitter's initial public offering. The Big Board said Friday it would allow trading firms to conduct a dry run of their systems, Saturday Oct. 26, 2013 to prepare for Twitter's IPO. (AP Photo/Richard Drew)

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