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3. Astronaut's 'yes'

Alternative clues for the word aok

• Go-ahead signal
• Armstrong's "All's well!"
• Thumb-to-forefinger signal
• Perfect, in rocketry
• Swell
• "Looks good"
• NASA's "all systems gO"
• Hunky-dory for short
• Fine, at NASA
• Thumbs-up letters