What three pairs of teams have had a Super Bowl rematch?

The Cowboys and Steelers have met in Super Bowls X, XIII, and XXX with the Steelers winning X and XIII and the Cowboys winning XXX.

The Dolphins and Redskins have met in Super Bowls VII and XVII with the Dolphins winning V and the Redskins winning XVII.

The Cowboys and Bills have met in Super Bowls XXVII and XXVIII with the Cowboys winning both games.

The 49ers and Bengals have met in Super Bowls XVI and XXIII with the 49ers winning both games.

And now, the Giants and Patriots played in Super Bowl XLII and will play in Super Bowl XLVI. The Giants won Super Bowl XLII.