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2U, one of a growing cadre of companies that help colleges take their academic programs online, announced Friday that it had taken steps toward an initial public offering of its stock. 2U has sought to differentiate itself from the other players in this market by focusing on high-prestige universities. Documents filed by the company with the Securities and Exchange Commission provide some insights into the shape and scope of the market of online service providers; Phil Hill of e-Literate offers an analysis here.