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Related Clues:
- The ''f'' in f-stop
- Photographic adjective
- The "f" in f-stop
- End of an era?
- Like some signs
- Extremely important
- ___ point (very center)
- Crucially important, essential
- Absolutely necessary or life-giving
- Essential to life, indispensable
- Absolutely essential
- Essential to life or critically important
- Extremely important, essential to success
- Essential to life, most important
- Urgently needed or absolutely necessary