i = 0
  while  i < len(lst) - 1:
    while lst[i] in lst[i + 1 : len(lst) - 1] :
      lst.reverse()
      lst.remove(lst[i])
      lst.reverse()
    i = i + 1



  for i in range (0,len(lst) - 1):
    for j in range (i,len(lst) - 1):
      if (j != i and lst[i] == lst[j]):
        del lst[j]