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Related Clues:
- Perfect, NASA-style
- NASA's 'all systems gO'
- Perfectly fine, informally
- Fine, to astronauts
- 'K3wl'
- Project Mercury affirmative
- Astronaut's affirmative
- [Thumbs up]
- Thumb-to-forefinger signal
- "All systems go"
- "No problem here"
- Mission control go-ahead
- 'Ready for takeoff!'
- Problem-free
- Astronaut's 'fine'