Expedition 52 flight engineers Randy Bresnik of NASA, left, and Paolo Nespoli of ESA rollup their sleeves as they start their second to last day of qualification exams with Expedition 52 flight engineer Sergey Ryazanskiy of Roscosmos, Thursday, July 6, 2017 at the Gagarin Cosmonaut Training Center (GCTC) in Star City, Russia. Photo Credit: (NASA/Bill Ingalls)

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