With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Ethiopia has central highlands.
text_B: The 1977 Champion Spark Plug 400 was a NASCAR Winston Cup Series racing event that took place on August 22 , 1977 , at Michigan International Speedway in the American community of Brooklyn , Michigan .. Michigan International Speedway. Michigan International Speedway. NASCAR. NASCAR. Winston Cup Series. Sprint Cup Series. During this era , Michigan International Speedway was a Mercury-dominated track .. Michigan International Speedway. Michigan International Speedway. It was also a track that suited a smooth driver or a driver that could change his driving tactics for Michigan International Speedway .. Michigan International Speedway. Michigan International Speedway
not_related.