5 - 2 = ?, 3, 4, 8 - 5 = ?, 1, 3, 7 - 4 = ?, 2, 3, 10 - 4 = ?, 5, 6, 4 - 3 = ?, 1, 7, 10 - 2 = ?, 7, 8, 10 - 8 = ?, 2, 3, 20 - 2 = ?, 18, 19, 6 - 9 = ?, pas possible, not possible

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