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1% 20-queens: 2% 7 13 11 8 6 18 10 17 9 20 16 19 15 12 14 4 2 5 3 1 3% 4q = [7, 13, 11, 8, 6, 18, 10, 17, 9, 20, 16, 19, 15, 12, 14, 4, 2, 5, 3, 1]; 5----------