With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: William McKinley was shot.
text_B: The 76th Grey Cup was the 1988 Canadian Football League championship game that was played at Lansdowne Park in Ottawa , between the BC Lions and the Winnipeg Blue Bombers .. Ottawa. Ottawa. 1988 CFL season. Canadian Football League. Canadian Football League. Lansdowne Park. Frank Clair Stadium. BC Lions. BC Lions. Winnipeg Blue Bombers. Winnipeg Blue Bombers. The Blue Bombers defeated the favoured Lions 22-21 .. This was the first Grey Cup game between two teams from west of Ontario , and the first to be won by a team which had only a .500 season .
not_related.