one
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There is nothing about gaps being a huge leap, it’s simple and basic understanding. A group of 3 or more stood together is a wall. Defenders stood apart are not a wall.
As I said before, I am in the camp that think the laws don't need to define a wall as any attempt will create more confusion that clarifying it. Lets say what you have said would be the definition. What is stood together? Do they have to touch each other? Does a one yard distance mean they are 'apart' (how about half a yard or two yards)? How do you measure the distance? which body parts count or don't count? Can they spread their arms or their feet wide apart to make the total coverage of keeping opponents away bigger?