With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Jimmy Carter led the international boycott of the Olympics in 1980.
text_B: The conquest of the Canary Islands by the Crown of Castille took place between 1402 and 1496 .. Crown of Castille. Crown of Castille. It can be divided into two periods  : the Conquista senorial , carried out by Castilian nobility in exchange for a covenant of allegiance with the crown , and the Conquista realenga , carried out by the Spanish crown itself , during the reign of the Catholic Monarchs .. Catholic Monarchs. Catholic Monarchs
not_related.