With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Armadillo World Headquarters was located outside of Texas.
text_B: The men 's 100 metres event at the 2000 World Junior Championships in Athletics was held in Santiago , Chile , at Estadio Nacional Julio Martinez Pradanos on 17 and 18 October .. 100 metres. 100 metres. 2000 World Junior Championships in Athletics. 2000 World Junior Championships in Athletics. Santiago. Santiago. Estadio Nacional Julio Martinez Pradanos. Estadio Nacional Julio Martinez Pradanos
not_related.