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Apple today seeded build 13C53 of OS X 10.9.2 to developers, marking the fifth beta iteration of 10.9.2



From MacRumors:
The release comes a week after the fourth OS X 10.9.2 beta, build 13C48, and over a month after the first OS X 10.9.2 beta. 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 13C53 to Developers