permutation date by koyama41

main=mapM putStrLn$[""]&29&29&11&14&4&0
x&y=[y-1..y*2+1]>>=foldr(%)x.show
x%y=[x:a|a<-y,all(/=x)a]

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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