Hello, I try now to make the optional exercise hanoi with 4 pegs, So I did on paper this : start temp1 temp2 end 3 2 1 first move : start -> temp2 start temp1 temp2 end 2 3 1 second move : start -> temp1 start temp1 temp2 end 1 2 3 now I tried to make this piece in code So I did : hanoi4 1 start _ _ end = "move 1 disk from " ++ [start] ++ " to " ++ [end] ++ ".\n" hanoi4 n start temp1 temp2 end = hanoi4 (n-1) start end temp1 temp2 ++ hanoi4 1 start end temp1 temp2 ++ hanoi4 (n-1) start temp1 end temp2 because on the first step start must be start and end must be temp1 and on the second step start must be start and end must be temp2 but when I run in I see this output : move 1 disk from a to b. move 1 disk from a to b. move 1 disk from a to b. move 1 disk from a to c. move 1 disk from a to d. move 1 disk from a to d. move 1 disk from a to d. Can anyone explain or let me see where my thinking took the wrong turn ? Roelof