With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Outfit (retailer) started out in 1992.
text_B: Kai Sakakibara is an Australian male BMX rider , representing his nation at international competitions .. BMX rider. BMX racing. He competed in the time trial event at the 2015 UCI BMX World Championships .. time trial event. 2015 UCI BMX World Championships – Men's time trial. 2015 UCI BMX World Championships. 2015 UCI BMX World Championships
not_related.