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When you finish a season with a 2-14 record, chances are you’re pretty bad on both sides of the ball. A team has only finished with two wins or fewer 20 times since the league expanded to 32 teams back in 2002, putting any 2-14 squad squarely inside the bottom four percent of teams that have …

Read more at CBS Sports: https://www.cbssports.com/nfl/news/49ers-burning-question-how-much-can-revamped-defense-improve-in-2017/