With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: A Song of Ice and Fire involves multiple characters.
text_B: The Great Manhattan Mystery Conclave was an annual convention for mystery writers and fans held in Manhattan , Kansas , United States .. convention. fan convention. mystery. mystery fiction. United States. United States. The Conclave was a non-profit organization .. non-profit organization. non-profit organization
not_related.