I want to know the answer to the following question:
How far away from the line of scrimmage must Canadian football defenders be?
All the background I'm provided with is that "In particular, Canadian football has 12 players on the field per team rather than 11; the field is roughly 10 yards wider, and 10 yards longer between end-zones that are themselves 10 yards deeper; and a team has only three downs to gain 10 yards, which results in less offensive rushing than in the American game.". Is that enough to answer the question?