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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