With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Portugal does not have a high-income advanced economy.
text_B: William W. Menasco is a topologist and a professor at the University at Buffalo .. topologist. topologist. University at Buffalo. University at Buffalo. He is best known for his work in knot theory .. knot theory. knot theory
not_related.