as the number of symbols increases, the length of the superpermutation increases, too. the superpermutation with only 1 symbol is only 1 long (1), while the 2nd superpermutation is 3 long (121). the 3rd superpermutation is 9 long (123121321), and the 4th one is 33 long (123412314231243121342132413214321). the length of the superpermutation with 5 symbols is 153, and it looks like this: