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l#1=pure<$>l l#n=[c:a:r|(ar|a:r)<r<-l#(n-1),c<-l,a/=c]
Try it online!Try it online!
Edit: Thanks to @xnor for taking off two bytes! I didn't know you could remove the parentheses in that context
l#1=pure<$>l l#n=[c:a:r|(a:r)<-l#(n-1),c<-l,a/=c]
Try it online!
l#1=pure<$>l l#n=[c:a:r|a:r<-l#(n-1),c<-l,a/=c]
