First Sentence:
THE EARTH IS ROUGHLY 4,500 MILLION YEARS OLD.
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Key Phrases - Statistically Improbable Phrases (SIPs):
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fossil cats, elongated upper canines, extinct cats, modern felids, living cheetah, carnivore guild, sequential reconstruction, living cats, modern cats, larger cats, fertilization system, third phalanx, more open terrain, true cats, cat species, second phalanx, retractable claws, running sequence, clouded leopard, smaller cats, limb proportions, spotted hyena, relative brain size, bodily proportions, fossil history
Key Phrases - Capitalized Phrases (CAPs):
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North America, Rancho La Brea, Friesenhahn Cave, South American, South African, Cerro Batallones, Northern Hemisphere, Old World, Bolt's Farm, The Changing Fauna, Spanish Miocene
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