Vettel will be world champion if:
he wins the Brazil GP
he finishes the race ahead of Alonso
Alonso wins and he finishes at least fourth
Alonso is second and he finishes at least seventh
Alonso is third and he finishes at least ninth.
Alonso will be world champion if:
he wins and Vettel finishes no better than fifth
he finishes second and Vettel no better than eighth
he finishes third and Vettel no better than 10th.
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