code: def optimize(self):
          
          subpattern = None
          if (self.content is not None and
              len(self.content) == 1 and len(self.content[0]) == 1):
              subpattern = self.content[0][0]
          if self.min == 1 and self.max == 1:
              if self.content is None:
                  return NodePattern(name=self.name)
              if subpattern is not None and  self.name == subpattern.name:
                  return subpattern.optimize()
          if (self.min <= 1 and isinstance(subpattern, WildcardPattern) and
              subpattern.min <= 1 and self.name == subpattern.name):
              return WildcardPattern(subpattern.content,
                                     self.min*subpattern.min,
                                     self.max*subpattern.max,
                                     subpattern.name)
          return self
docs: Optimize certain stacked wildcard patterns.