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Related Clues:
- Pig might fly over such ages
- Given so much time, pig might fly
- Thousands of centuries
- Forever, so to speak
- Gazillions of years
- Particular periods of time
- Very long spans
- Billions and billions of years
- Long periods, geologically
- Long geologic stretches
- Endless periods
- Time to evolve?
- Distinctive eras
- How long it takes mountains to form
- Eocene and Miocene