With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Superman has been portrayed by an American.
text_B: Waldbach may refer to  :. Waldbach , Styria , a former municipality in Styria , Austria. Waldbach-Monichwald , a municipality in Styria , Austria. Waldbach-Monichwald. Waldbach-Monichwald. Waldbach , a former municipality , today part of Bretzfeld , Baden-Wurttemberg , Germany. Bretzfeld. Bretzfeld. Waldbach -LRB- Gurzenicher Bach -RRB- , a river of North Rhine-Westphalia , Germany , tributary of the Gurzenicher Bach. Waldbach -LRB- Waldbach -RRB- , tributary of the similar named river Waldbach above that is a tributary of the Gurzenicher Bach. Waldbach -LRB- Rohr -RRB- , a river of North Rhine-Westphalia , Germany , tributary of the Rohr. Waldbach -LRB- Schwalbach -RRB- , a river of Hesse , Germany , tributary of the Schwalbach
not_related.