=9: 0+9, 1+8, 2+7, 3+6, 4+5, 5+4, 6+3, 7+2, 8+1, 9+0, 9-9, 10-1, 11-2, 12-3, 13-4, 14-5, 15-6, 16-7, 17-8, 18-9, =10: 0+10, 1+9, 2+8, 3+7, 4+6, 5+5, 6+4, 7+3, 8+2, 9+1, 10+0, 10-0, 11-1, 12-2, 13-3, 14-4, 15-5, 16-6, 17-7, 18-8,

Addition and Subtraction =9, =10 Sorting

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