Verdadero, 9 + 10 = 19, 4 + 16 = 20, 2 + 6 = 8, 8 + 11 = 19, 5 + 7 = 12, Falso, 18 + 2 = 12, 13 + 5 = 6, 17 + 4 = 4, 17 + 1 = 2, 15 + 13 = 20.

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