With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: That's So Raven debuted in 2003.
text_B: The Sirhowy Railway was a railway line which operated between 1860 and 1970 in the Sirhowy Valley , Monmouthshire , South East Wales .. railway. railway. Sirhowy Valley. Sirhowy Valley. Monmouthshire. Monmouthshire ( historic ). South East Wales. South East Wales
not_related.