With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Cersei Lannister is in two books in A Song of Ice and Fire.
text_B: Stefan Brankovic -LRB- Стефан Бранковић c. 1417 -- 9 October 1476 -RRB- , also known in historiography as Stefan the Blind , was briefly the despot -LRB- ruler -RRB- of the Serbian Despotate between 1458 and 1459 , member of the Brankovic dynasty .. Brankovic. Brankovic dynasty. despot. Despot ( court title ). Serbian Despotate. Serbian Despotate. Brankovic dynasty. Brankovic dynasty
not_related.