Correct: 2 + 2 = 4, 8 - 3 = 5, 2 + 1 = 3, 6 + 2 = 8, 20 - 10 = 10, 5 - 3 = 2, 10 - 5 = 5, 2 + 4 = 6, 8 - 4 = 4, 3 + 3 = 6, Incorrect: 3 + 2 = 1, 8 - 3 = 6, 3 + 5 = 7, 10 - 3 = 9, 2 + 6 = 10,

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