10 - 5 = ?, 13 - 3 = ?, 5 - 5 = ?, 7 - 2 = ?, 10 - 8 = ?, 8 - 3 = ?, 10 - 9 = ?, 18 - 1 = ?, 6 - 3 = ?, 12 - 2 = ?, 10 - 4 = ?, 14 - 4 = ?, 18 - 4 = ?, 16 - 2 = ?, 20 - 8 = ?, 6 - 6 = ?, 7 - 0 = ?, 4 - 1 = ?, 8 - 6 = ?, 9 - 2 = ?, 5 - 2 = ?.

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