x 5: 2 and 10, 3 and 15, 4 and 20, 5 and 25, 6 and 30, 10 and 50, + 11: 2 and 13, 3 and 14, 4 and 15, 5 and 16, 6 and 17, 7 and 18, - 4: 20 and 16, 14 and 10, 50 and 46, 30 and 26, 40 and 36, 18 and 14, - 9: 20 and 11, 30 and 21, 19 and 10, 45 and 36, 9 and 0, 12 and 3,

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