With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Luxembourg had a population of 576,249 humans in 2016.
text_B: The Pacotuba National Forest -LRB- Floresta Nacional de Pacotuba -RRB- is a national forest in the state of Espirito Santo , Brazil .. national forest. National forest ( Brazil ). Espirito Santo. Espirito Santo
not_related.