'Return a string representation of this rule.  It has the form::
<ExpandLeftRule: \'<NN|DT|JJ>\', \'<NN|JJ>\'>
Note that this representation does not include the
description string; that string can be accessed
separately with the ``descr()`` method.
:rtype: str'

def __repr__(self):

    return ((((u'<ExpandLeftRule:    ' + unicode_repr(self._left_tag_pattern)) + u',    ') + unicode_repr(self._right_tag_pattern)) + u'>')
