code: def branches(self):
          
          # We need to read the _cte_node_children attribute, so ensure it exists.
          self._ensure_parameters()
          return self.filter(
              **{"%s__id__in" % self.model._cte_node_children: self.all()}
          ).distinct()
docs: Returns a :class:`QuerySet` of all branch nodes (nodes with at least
              one child).
  
              :return: A :class:`QuerySet` of all leaf nodes (nodes with at least
                  one child).