xvec = {1:3, 2:2, 3:1, 4:3, 5:2, 6:1, 7:3, 8:2, 9:1} yvec = {1:1, 2:1, 3:1, 4:2, 5:2, 6:2, 7:3, 8:3, 9:3} ...

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