With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sierra Leone became an independent nation in 1961.
text_B: Maen-Roch is a commune in the department of Ille-et-Vilaine , western France .. commune. Communes of France. department. Departments of France. Ille-et-Vilaine. Ille-et-Vilaine. France. France. The municipality was established on 1 January 2017 by merger of the former communes of Saint-Brice-en-Cogles -LRB- the seat -RRB- and Saint-Etienne-en-Cogles .. Saint-Brice-en-Cogles. Saint-Brice-en-Cogles. Saint-Etienne-en-Cogles. Saint-Etienne-en-Cogles
not_related.