With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Superman is a Metropolis citizen.
text_B: Peha are a Slovak band originating from Presov , Slovakia .. Presov. Presov. They won a 2006 Aurel Award for Best Song with their hit `` Spomal '' .. Aurel Award. Aurel Awards. hit. List of number-one songs of the 2000s ( Czech Republic )
not_related.