With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Lightning rods are all made of conductive materials, like copper.
text_B: The women 's triple jump at the 2010 IAAF World Indoor Championships was held at the ASPIRE Dome on 12 and 13 March .. triple jump. triple jump. 2010 IAAF World Indoor Championships. 2010 IAAF World Indoor Championships. ASPIRE Dome. ASPIRE Academy for Sports Excellence
not_related.