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(l!!) l=[1..9]++do x<9]++[x*10+t|x<-l;[x*10+t|t<l,t<-[0..9],(mod x 10-t)^2==1]
Try it online!Try it online!
(l!!) l=[1..9]++do x<-l;[x*10+t|t<-[0..9],(mod x 10-t)^2==1]
Try it online!
(l!!) l=[1..9]++[x*10+t|x<-l,t<-[0..9],(mod x 10-t)^2==1]
