With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Seattle is a town.
text_B: Iserbrook is a quarter in the Altona borough of the Free and Hanseatic city of Hamburg in northern Germany .. Altona. Altona, Hamburg. Free and Hanseatic city of Hamburg. Hamburg. Germany. Germany. In 2007 the population was 10,660 .
not_related.