The conversation between human and AI assistant.
[|Human|] Which years was the Tour de France not raced?
[|AI|] The Tour was not contested in 1915, 1916, 1917 and 1918 due to World War 1. It was again postponed from 1940 through 1945 due to World War 2.
[|Human|] 
Which years was the Tour de France not raced?