message: Update iterator-for-combination.py
diff: @@ -43,11 +43,11 @@ class CombinationIterator2(object):
  """
  self.__characters = characters
  self.__combinationLength = combinationLength
  - self.__it = self.__iterative_dfs()
  + self.__it = self.__iterative_backtracking()
  self.__curr = None
  self.__last = characters[-combinationLength:]
  - def __iterative_dfs(self):
  + def __iterative_backtracking(self):
  def conquer():
  if len(curr) == self.__combinationLength:
  return curr
  