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September 20, 2011
stronaut Peggy A. Whitson, Expedition 16 commander, and cosmonaut Yuri I. Malenchenko, flight engineer representing Russia's Federal Space Agency, work in the Quest Airlock of the International Space Station as astronaut Scott Parazynski and Doug Wheelock, STS-120 mission specialists, exit the station for the mission's fourth spacewalk while Space Shuttle Discovery is docked with the station.

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