Here is how you do it:
input is the list of words, with duplicates
you need an additional list (let's call it x)
and an integer (let's call it i)
for each item in the list,
if it isn't in x, add it, increment i, and print it followed by a space
if it is in x, print a newline, and spaces equal to the number of characters in each preceding word after index i in x + 1 for each word in that range. There should be x.index(item) - i things, and this loops. Python indices, I would think, take care of the special case where you need to loop around, sans the printing of a newline, so make sure you do that after you print the spaces for the last item.
I'm sorry you seemed to have not gotten help on this. The title seemed a little silly to me.