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Apple today seeded build 13C39 of OS X 10.9.2 to developers, marking the second developer beta iteration of 10.9.2



From MacRumors:
The release comes almost a month after the first OS X 10.9.2 beta, build 13C32, was seeded to developers. The update is available to registered developers through the Software Update mechanism in the Mac App Store as well as through the Mac Dev Center.
  Apple Seeds OS X Mavericks 10.9.2 Build 13C39 to Developers