def get_lus_from_synset(self, syn_id):
        """Returns a list of (word, lu_id) tuples given a synset ID"""

        root = self.get_synset_xml(syn_id)
        elem_synonyms = root.find( ".//synonyms" )


        lus = []
        for elem_synonym in elem_synonyms:
            synonym_str = elem_synonym.get( "c_lu_id-previewtext" )        # get "c_lu_id-previewtext" attribute
            # synonym_str ends with ":<num>"
            synonym = synonym_str.split( ':' )[ 0 ].strip()
            lus.append( (synonym, elem_synonym.get( "c_lu_id") ) )
        return lus
Returns a list of (word, lu_id) tuples given a synset ID