def optimize(self):
        """Optimize certain stacked wildcard patterns."""
        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
dataset/ETHPy150Open anandology/pyjamas/pgen/lib2to3/pytree.py/WildcardPattern.optimize/original