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Fullerenes are a distinct class of carbon allotropes composed entirely of carbon atoms arranged in closed, hollow cage-like structures formed by a combination of pentagonal and hexagonal rings. The most well-known fullerene is C₆₀, also called buckminsterfullerene, which resembles a truncated icosahedron ______ ________ ________ __________ ____ _______ _____ _________ ______ ___ _____ _____.
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