With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Black Mirror is a British fiction series.
text_B: Bistrica -LRB- Gornji Vakuf -RRB- is a village in the municipality of Gornji Vakuf , Bosnia and Herzegovina .. Gornji Vakuf. Gornji Vakuf. village. village. municipality. Municipalities of Bosnia and Herzegovina. Bosnia and Herzegovina. Bosnia and Herzegovina. It was the place of a massacre in the Croat -- Bosniak War in August 1993
not_related.