With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: To Kill a Mockingbird was published in 1960.
text_B: Dragon Flame is the fourteenth novel in the long-running Nick Carter-Killmaster series of spy novels .. novel. novel. Nick Carter-Killmaster. Nick Carter-Killmaster. Carter is a US secret agent , code-named N-3 , with the rank of Killmaster .. He works for AXE -- a secret arm of the US intelligence services .
not_related.