With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Lee Harvey Oswald assassinated the President of the United States.
text_B: Friedhelm Ferdinand Sack -LRB- born 30 May 1956 in Mariental -RRB- is a Namibian sport shooter .. Mariental. Mariental, Namibia. sport shooter. sport shooting. He competed at the 1996 Summer Olympics , 2000 Summer Olympics and 2004 Summer Olympics for his country .. 1996 Summer Olympics. Shooting at the 1996 Summer Olympics. 2000 Summer Olympics. Shooting at the 2000 Summer Olympics. 2004 Summer Olympics. Shooting at the 2004 Summer Olympics. his country. Namibia at the Olympics. He is affiliated with the Windhoek Central Shooting Club .
not_related.