1 + 3 - 3 + 1 , 9 + 7 - 7 + 9, 5 + 10 - 10 + 5, 8+4 - 4+8, 9+0 - 0+9, 7+3 - 3+7, 3+8 - 8+3, 4x2 - 2X4, 6X5 - 5X6, 10x10 - 10x10,

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