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1 + 1 - 2, 2 + 2 - 4, 3 + 3 - 6, 4 + 4 - 8, 5 + 5 - 10, 6 + 6 - 12, 7 + 7 - 14, 8 + 8 - 16, 9 + 9 - 18, 10 + 10 - 20, 11 + 11 - 22, 12 + 12 - 24,

Coppie gemelle

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