With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: From 1556 to 1605, while Akbar ruled the empire, it tripled in size.
text_B: The Daia River is a tributary of the Secas River in Romania .. Romania. Romania. Secas. Secas River ( Sebes ). Secas River. Secas River ( Sebes )
not_related.