With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: One of the smallest countries in Africa is Burundi.
text_B: The 1997 SEAT Open was a women 's tennis tournament played on indoor carpet courts in Luxembourg City in Luxembourg that was part of Tier III of the 1997 WTA Tour .. Tier III. WTA Tier III tournaments. Luxembourg City. Luxembourg ( city ). Luxembourg. Luxembourg. tennis. tennis. indoor carpet courts. Tennis court#Indoor courts. 1997 WTA Tour. 1997 WTA Tour. It was the second edition of the tournament and was held from October 20 through October 26 , 1997 .
not_related.