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3 3 Stack - Start by looking at the film to determine the creases you've got to defend...then you can give your linebackers assignments.
More options - More defensive schemes and options on how your linebackers work with your down linemen to stop the offense.
More Stunts - Here's more stunts you can use to confuse the offensive line and mess with their blocking schemes (and their running backs)!
Film Reviews - Here's a good film review "how to" and a demonstration of some of the stunts that were covered in the first 3 segments.