With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Fifty Shades of Grey was authored by E. L. James.
text_B: The Imbe River -LRB- Rio do Imbe -RRB- is a river in the state of Rio do Janeiro , Brazil .. Brazil. Brazil. Rio do Janeiro. Rio de Janeiro ( state ). The Segundo do Norte , Morumbeca , Aleluia and Mocoto rivers , which rise in the Desengano State Park , are tributaries of the Imbe River .. Desengano State Park. Desengano State Park. The Imbe flows into the Lagoa de Cima -LRB- Cima Lake -RRB- .. From that lake the Ururai River flows to the Lagoa Feia .. Ururai River. Ururai River
not_related.