2 + 9 = ?, 12 - 9 = ?, 10 + 10 = ?, 20 - 5 = ?, 8 + 8 = ?, 9 + 7 = ?, 14 - 7 = ?, 18 - 9 = ?, 13 + 5 = ?, 6 + 10 = ?, 17 - 8 = ?, 15 + 10 = ?, 20 - 9 = ?, 11 + 8 = ?, 19 - 19 = ?, 20 + 20 = ?, 20 - 10 = ?, 5 + 15 = ?, 3 + 17 = ?, 14 - 6 = ?, 5 + 3 = ?, 7 - 2 = ?, 8 + 10 = ?, 6 - 3 = ?, 17 + 5 = ?, 8 + 12 = ?, 12 - 6 = ?, 8 + 10 = ?, 16 - 15 = ?, 4 + 5 = ?, 16 - 6 = ?, 13 - 8 = ?, 9 + 8 = ?, 16 - 7 = ?, 10 - 7 = ?, 6 + 8 = ?, 7 + 13 = ?.
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