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| Necessary Line |
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The imaginary line the offense must cross to achieve a new first down.
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| Neutral Zone |
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The region that contains the ball as it sits on the ground before each play; the area between the two lines of scrimmage.
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| Nfl Championship |
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The game held from 1933 through 1965 to decide the champion of professional football; renamed the Super Bowl in 1966.
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| Nickel Defense |
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When a defense brings in a 5th defensive back to replace a linebacker on the field, increasing its pass coverage.
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| Nickel Defense or Nickel Package |
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When a defense brings in a 5th defensive back to replace a linebacker on the field, increasing its pass coverage or give a different look to the blitz.
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