Size of LazyCell:  the size of the intension plus accounting for
        excluded and included additions.

        The exclusions are assumed to be part of the set
        The inclusions are assumed to NOT be part of the intension

def size(self):
        """
        Size of LazyCell:  the size of the intension plus accounting for
        excluded and included additions.

        The exclusions are assumed to be part of the set
        The inclusions are assumed to NOT be part of the intension
        """
        return self._size_full_intension \
                    - len(self.exclude)\
                    + len(self.include)