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