20 - 10 = ?, 10, 30, 30 + 10 = ?, 40, 20, 40 + 10 = ?, 40, 30, 50 + 10 = ?, 30, 40, 33 - 10 = ?, 23, 13, 45 - 10 = ?, 25, 35, 57 - 10 = ?, 47, 48, 68 - 10 = ?, 47, 58, 72 - 10 = ?, 62, 73, 27 - 10 = ?, 37, 17.

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