With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: South Korea is a developed country in East Asia.
text_B: Richelida or Richilda -LRB- died between 1034 and 1037 -RRB- was a member of the dynasty known to historians as the Giselbertiners -LRB- or Giselbertini -RRB- .. Her second husband was Boniface III of Tuscany .. Boniface III of Tuscany. Boniface III of Tuscany
not_related.