With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The American Broadcasting Company is nicknamed "The American Network."
text_B: The Negreasca River is a tributary of the Calmatui River in Romania .. Romania. Romania. Calmatui. Calmatui River ( Braila ). tributary. tributary. Calmatui River. Calmatui River ( Braila )
not_related.