With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Trevor Berbick was born in 1954.
text_B: Trevor Berbick -LRB- August 1 , 1954 -- October 28 , 2006 -RRB- was a Jamaican Canadian professional boxer who competed from 1976 to 2000 .. Jamaican Canadian. Jamaican Canadian. professional boxer. professional boxer. He won the WBC heavyweight title in 1986 by defeating Pinklon Thomas , but lost it in his first defence to Mike Tyson , who was then undefeated at 20 years old .. WBC. World Boxing Council. heavyweight. heavyweight. Pinklon Thomas. Pinklon Thomas. Mike Tyson. Mike Tyson. Berbick was also the last boxer to fight Muhammad Ali , defeating him in 1981 .. Muhammad Ali. Muhammad Ali. As an amateur , Berbick won a bronze medal in the heavyweight division at the 1975 Pan American Games .. Pan American Games. Pan American Games. heavyweight. heavyweight. amateur. amateur boxing. 1975 Pan American Games. 1975 Pan American Games. In both his early and late professional career he held the Canadian heavyweight title twice , from 1979 to 1986 and 1999 to 2001 .. heavyweight. heavyweight
related.