With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Marlon Brando took part in a film by someone who died in February.
text_B: The 15th Pan American Games were held in Rio de Janeiro , Brazil from 13 July 2007 to 29 July 2007 .. Rio de Janeiro. Rio de Janeiro. 15th Pan American Games. 2007 Pan American Games. Brazil. Brazil
not_related.