PAT scrimmage line

[MikeStrybel]

I am new to HS rule set football officiating - I help cach my son's team so I figured it was time to make it official. I don't want to be the coach who doesn't know the rules. I see enough of that in baseball.

The PAT line of scrimmage is a bit confusing to me. I understand we need 7 on the line, but what constitutes the line? In a scrimmage the other day, we were told that only our far wings can be a step behind the rest of the linemen. In another scrimmage, we were told that we can have the end be a step behind his interior teammate and the win can be a step behind him. I have searched for a diagram showing legal and illegal PAT formations but come up dry. I would appreciate any clarification from you. Links to these formations will help me explain it better to my players. Thank you!