With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The Twilight series's first novel was called Twilight.
text_B: Mali competed at the 2011 World Championships in Athletics from August 27 to September 4 in Daegu , South Korea .. Daegu. Daegu. Mali. Mali. 2011 World Championships in Athletics. 2011 World Championships in Athletics. South Korea. South Korea. A team of 2 athletes was. announced to represent the country. in the event .
not_related.