With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Patrick Bateman is the author of the novel American Psycho.
text_B: Patrick Bateman is a fictional character , the villain protagonist and narrator of the novel American Psycho by Bret Easton Ellis , and its film adaptation .. Bret Easton Ellis. Bret Easton Ellis. American Psycho. American Psycho. American. United States. narrator. narrator. film adaptation. American Psycho ( film ). He is a wealthy , materialistic Wall Street investment banker who leads a double life as a serial killer .. materialistic. Economic materialism. investment banker. investment banker. serial killer. serial killer. Bateman has also briefly appeared in other Ellis novels .
related.