15-3=, 12, 8, 6, 9, 16-2=, 3, 14, 5, 8, 12-1=, 5, 3, 11, 4, 14-2=, 5, 6, 1, 12, 15-4=, 9, 2, 4, 11, 18-5=, 2, 13, 6, 9, 17-1=, 16, 9, 5, 4, 20-2, 4, 18, 7, 9, 17-5, 6, 12, 3, 8, 16-1=, 3, 2, 15, 9, 15-6=, 9, 7, 6, 2, 13-5=, 6, 8, 9, 10, 20-10=, 14, 12, 10, 17, 19-4=, 10, 13, 14, 15, 13-3=, 10, 11, 13, 15

subtraction K2

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