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3–4 defense
American football defensive formation / From Wikipedia, the free encyclopedia
In American football, the 3–4 defense is a common defensive alignment consisting of three down linemen and four linebackers. It is called a "base defense" because it will readily switch to other defensive alignments (such as a nickel defense or a dime defense) as circumstances change. Alternatively, some defenses use a 4–3 defense: four down linemen and three linebackers.
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