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2007 Official playing rules of the National Football League
- "Two-thousand and seven official playing rules of the National Football League"
- "Two-thousand seven official playing rules of the National Football League"
- "Official playing rules of the National Football League"
- "Official rules of the NFL"
- "Official rules of the NFL"@en
- "Official rules of the National Football League"@en
- "2007 Official playing rules of the National Football League"@en
- "2007 official playing rules of the National Football League"