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Gli amici del 20: 11+9, 12+8, 18+2, 14+6, 10+10, 6+14, 9+11, 15+5, non amici del 20: 10+5, 7+7, 5+5, 11+6, 10+3, 14+7, 19+2, 14+9, 3+9, 20+20,

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