With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Robert Duvall starred in five films.
text_B: The 151st Cavalry Regiment is a United States Army cavalry regiment currently represented in the Arkansas Army National Guard by 1st Squadron , 151st Cavalry Regiment , headquartered in Warren , Arkansas , an element of the 39th Infantry Brigade Combat Team .. Arkansas Army National Guard. Arkansas Army National Guard. 39th Infantry Brigade Combat Team. 39th Infantry Brigade Combat Team
not_related.