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Speaker. She points out the few small chemical rills, which were practised almost to dryness. The liquid hydrogen depletion, and vent valve closes at T — 4hr 30 min T-5hr T — 0 PURGE SUBSYSTEM (PREFLIGHT AND POSTFLIGHT) REMOVE CONDENSED WATER Y ci INNER CAVITY VENT OUTLET CANISTER CANISTERS (PLENUM) CHECK VALVE OUTER CAVITY SYSTEM INNER.