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2.21 * 10^7 = (4/3) * pi * (3 * 6371^2 * d + 3 * 6371 * d^2 + d^3)
2.21 * 10^7 = (4/3) * pi * (3 * 6371^2 * d + 3 * 6371 * d^2 + d^3)
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