(self, other)
Implementation of containment.
           Other is guaranteed to be FreeModuleElement.
Implementation of containment.
           Other is guaranteed to be FreeModuleElement.
Implementation of containment . Other is guaranteed to be FreeModuleElement .
def _contains(self, other):
        """Implementation of containment.
           Other is guaranteed to be FreeModuleElement."""
        raise NotImplementedError
def _contains ( self , other ) : raise NotImplementedError