code: def __edit_distance_alt(self, words):
          
          words = [x.lower() for x in words]
          return [e2 for e1 in words for e2 in self.edit_distance_1(e1)]
docs: Compute all strings that are 1 edits away from all the words using
              only the letters in the corpus
  
              Args:
                  words (list): The words for which to calculate the edit distance
              Returns:
                  set: The set of strings that are edit distance two from the \
                  provided words