The NFL is entering Week 5 of the season.
Only two teams remain undefeated with a perfect 4-0 record.
The Arizona Cardinals are one of the two teams with a perfect record.
The Los Angeles Rams are the other team with a perfect record.
Both teams have not lost a game yet this season.
The Cardinals and Rams will face off against each other in Week 4.
The winner of the Cardinals vs. Rams game will be the only remaining undefeated team in the NFL.
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