<prompt> Pedzisa mutsara unotevera: Ferrari yakatanga mwaka wa1991 netariro huru yokukunda mukwikwidzi. Jean Alesi akasaina chibvumirano neScuderia apo Nigel Mansell akadzokera kuchikwata cheWilliams. Mugumisiro wakanakisisa we642 wakanga uri nzvimbo yechipiri yakatorwa naAlain Prost pa1991 United States Grand Prix, yakaitwa paPhoenix street circuit. 642 yakatsiviwa neFerrari 643 pa  <response>: Mubairo Mukuru weFrance wa1991. 