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- queen(x)=select(r->(r[1]-x[1]==-1*(r[2]-x[2])||r[1]-x[1]==r[2]-x[2]||r[1]==x[1]||r[2]==x[2])&&[r[1],r[2]]!=[x[1],x[2]],setbinop((x,y)->concat(x,y),[1,2,3,4,5,6,7,8],[1,2,3,4,5,6,7,8]))
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