code: def sortedneighbourhood(self, *args, **kwargs):
          
          indexer = SortedNeighbourhood(*args, **kwargs)
          self.add(indexer)
  
          return self
docs: Add a Sorted Neighbourhood Index.
  
          Shortcut of :class:`recordlinkage.index.SortedNeighbourhood`::
  
              from recordlinkage.index import SortedNeighbourhood
  
              indexer = recordlinkage.Index()
              indexer.add(SortedNeighbourhood())