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(1)16 - 4 =
(2)12 - 2 =
(3)11 - 1 =
(4)12 - 2 =
(5)14 - 3 =
(6)13 - 2 =
(7)17 - 4 =
(8)18 - 6 =
(9)12 - 1 =
(10)15 - 4 =
(11)17 - 3 =
(12)15 - 5 =
(13)19 - 9 =
(14)15 - 2 =
(15)14 - 1 =
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