1+1 - 2, 1+2 - 3, 2+2 - 4, 3+2 - 5, 10-4 - 6, 8+1 - 7, 10-2 - 8, 5+6 - 11, 15-2 - 13, 8+6 - 14, 7+8 - 15, 16+3 - 19, 6+3 - 9,

Addition and Subtraction Memory

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