def allval(self):
d = dict(self.__dict__.items())<EOL>d['<STR_LIT>'] = self.sl<EOL>d[self.level] = <NUM_LIT:0><EOL>cls = self.get_class(self.sl)<EOL>return cls(**d)<EOL>
Convert the last value to zero. This form represents the entire higher summary level at the granularity
        of the lower  summary level. For example, for a county, it means 'All counties in the state