With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: After World War 2, the United Nations was established.
text_B: Immortalis is the third book in the second DemonWars Saga trilogy by R. A. Salvatore .. second DemonWars Saga trilogy. The DemonWars Saga#The Second Trilogy. R. A. Salvatore. R. A. Salvatore. DemonWars Saga. The DemonWars Saga. The book is also the last of seven books in the combined DemonWars Saga .. DemonWars Saga. The DemonWars Saga
not_related.