With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Selene serves as the central character in a book based on a story.
text_B: The 1921 Harvard Crimson football team represented Harvard University in the 1921 college football season .. Harvard University. Harvard University. 1921 college football season. 1921 college football season. The Crimson finished with a 7-2-1 record under third-year head coach Bob Fisher .. Bob Fisher. Bob Fisher ( American football coach ). Walter Camp selected one Harvard player , guard John Fiske Brown , as a first-team member of his 1921 College Football All-America Team .. Walter Camp. Walter Camp. 1921 College Football All-America Team. 1921 College Football All-America Team
not_related.