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In page 1991 NBA Finals:

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In the playoffs, the Bulls lost only once in the first three rounds. They swept the New York Knicks in the first round, then eliminated the Philadelphia 76ers in the second round. Their much-awaited rematch with the Detroit Pistons in the conference finals showcased the maturity and poise that the Bulls displayed all season, as they swept the injury-riddled Pistons team. In a last show of defiance, most of the Pistons walked off the court with :08 left on the clock in a blowout loss at home so as not to congratulate the new Eastern Conference champions, though Joe Dumars, Vinnie Johnson, and John Salley did remain to shake the Bulls' hands.[1]