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Every NFL team has flaws. Some are huge, and some are small. All are noticeable, and entering training camp, NFL teams are looking at how they can improve them.

For the 49ers, their biggest weakness may be something small. It may not even be a weakness on most teams. Yet it stands as their biggest flaw.

The Raiders, on the other hand, may have weaknesses that are small for them but huge for another team. In other words, not all flaws are created equal.

Just what is each team looking at as training camp approaches? What will be the biggest issue for each team in 2013?