human
Complete the below
def _synset_relations(word, synset, synset_relations):

    ''''Builds the HTML string for the relations of a synset
    :param word: The current word
    :type word: str
    :param synset: The synset for which we\'re building the relations.
    :type synset: Synset
    :param synset_relations: synset keys and relation types for which to display relations.
    :type synset_relations: dict(synset_key, set(relation_type))
    :return: The HTML for a synset\'s relations
    :rtype: str'
    '''
assistant
#Here is the Python program you requested.
    if (not (synset.name() in synset_relations)):
        return ''
    ref = Reference(word, synset_relations)
    def relation_html(r):
        if isinstance(r, Synset):
            return make_lookup_link(Reference(r.lemma_names()[0]), r.lemma_names()[0])
        elif isinstance(r, Lemma):
            return relation_html(r.synset())
        elif isinstance(r, tuple):
            return ('%s\n<ul>%s</ul>\n' % (relation_html(r[0]), ''.join((('<li>%s</li>\n' % relation_html(sr)) for sr in r[1]))))
        else:
            raise TypeError(('r    must    be    a    synset,    lemma    or    list,    it    was:    type(r)    =    %s,    r    =    %s' % (type(r), r)))
    def make_synset_html(db_name, disp_name, rels):
        synset_html = ('<i>%s</i>\n' % make_lookup_link(copy.deepcopy(ref).toggle_synset_relation(synset, db_name).encode(), disp_name))
        if (db_name in ref.synset_relations[synset.name()]):
            synset_html += ('<ul>%s</ul>\n' % ''.join((('<li>%s</li>\n' % relation_html(r)) for r in rels)))
        return synset_html
    html = (('<ul>' + '\n'.join((('<li>%s</li>' % make_synset_html(*rel_data)) for rel_data in get_relations_data(word, synset) if (rel_data[2] != [])))) + '</ul>')
    return html