Iter 1  -  Iter 2
           (1 2 3) -> (1 2 3)
                   -> (1 3 2)
            
(1 2 3) -> (2 1 3) -> (2 1 3)
                   -> (2 3 1)

           (3 2 1) -> (3 2 1)
                   -> (3 1 2)