 Complete the following phrase:  Since the first World Championship Grand Prix in 1950, red flags have been shown in seventy-eight races, with the latest one being at the 2021 Belgian Grand Prix on 29 August. A total of twenty-six races were restarted on the first lap, while thirteen were not restarted, nine because of rain and four due to crashes involving drivers. Another five races were stopped due to incidents that resulted in fatalities: The 1975 Spanish Grand Prix was stopped on lap twenty-nine and not restarted after Rolf Stommelens car crashed into a spectator area, killing five people. The 