With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Abraham Lincoln was married to Stephen A. Douglas.
text_B: Bob Isbister Jr. was an all-star and Grey Cup champion Canadian football player , playing from 1937 to 1943 .. Grey Cup. Grey Cup. Bob Isbister. Bob Isbister. He was the son of Canadian football hall-of-famer Bob Isbister .. Bob Isbister. Bob Isbister. A graduate of the University of Toronto and a star with the Varsity Blues , Isbister joined the Toronto Argonauts for a brief but successful football career .. University of Toronto. University of Toronto. Toronto Argonauts. Toronto Argonauts. Varsity Blues. Toronto Varsity Blues. Playing only 11 regular season games and 6 playoff games for the Boatmen , he won two Grey Cup championships and was twice an all-star .. Grey Cup. Grey Cup. He was transferred by his employer to Hamilton in 1939 , where he joined his father 's team , the Hamilton Tigers , and was once again an all-star selection .. Hamilton Tigers. Hamilton Tigers. Isbister joined the RCN during World War Two and played two final seasons with the Halifax Navy squad .. RCN. Royal Canadian Navy. World War Two. World War Two
not_related.