12 + 5 =, 15, 16, 17, 20 - 8 =, 10, 12, 8, 9 + 6 =, 10, 13, 15, 10 x 2 =, 20, 15, 12, 6 : 2 =, 4, 3, 8, 1 x 1 =, 2, 1, 0.

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