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1)3 - 2 =
(2)10 - 10 =
(3)18 - 8 =
(4)13 - 3 =
(5)12 - 11 =
(6)12 - 12 =
(7)6 - 3 =
(8)6 - 4 =
(9)11 - 2 =
(10)8 - 3 =
(11)13 - 3 =
(12)1 - 1 =
(13)15 - 3 =
(14)10 - 9 =
(15)3 - 3 =
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