With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Black Panther is a motion picture about a superhero.
text_B: The Malvathu River -LRB- මල වත ඔය Malvathu Oya , அருவி ஆறு Aruvi Aru -RRB- is a 164 km long river in Sri Lanka , connecting the city of Anuradhapura , which was the capital of the country for over 15 centuries , to the coast of Mannar .. Anuradhapura. Anuradhapura. Sri Lanka. Sri Lanka. Mannar. Mannar, Sri Lanka. It currently ranks as the second longest river in the country , with a great historic significance .. The northern part of the river , and sometimes the whole river , was once been known as Aruvi Aru .
not_related.