With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Tetris was programmed by Alexey Pajitnov in 1981.
text_B: The United States occupation of Cuba may refer to  :. the United States Military Government in Cuba -LRB- 1898 -- 1902 -RRB-. United States Military Government in Cuba. United States Military Government in Cuba. the Second Occupation of Cuba -LRB- 1906 -- 09 -RRB-. Second Occupation of Cuba. Second Occupation of Cuba. the Sugar Intervention -LRB- 1917-1922 -RRB- , a third occupation of Cuba. Sugar Intervention. Sugar Intervention. the continuing American presence at Guantanamo Bay Naval Base. Guantanamo Bay Naval Base. Guantanamo Bay Naval Base
not_related.