With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sunburn is a film released 1979.
text_B: Ivan Navarro was the defender of championship title , but he lost to Marco Chiudinelli in the quarterfinal .. Ivan Navarro. Ivan Navarro ( tennis ). Marco Chiudinelli. Marco Chiudinelli. Karol Beck won in the final 6 -- 4 , 6 -- 3 , against Thiago Alves .. Karol Beck. Karol Beck. Thiago Alves. Thiago Alves ( tennis ). It took place in Pozoblanco , Spain between 6 and 12 July 2009 .. Pozoblanco. Pozoblanco. Spain. Spain
not_related.