American Football Rules IFAF Approved Ruling 7-1-4:VIII

VIII. Team A lines up with A11 ten yards directly behind the snapper. The other three backs are split wide, all outside the tackle box. Only four Team A linemen have uniform numbers between 50 and 79. A11 receives the backward pass from the snapper with Team A in this formation. RULING: Live-ball foul. Illegal formation, not enough players numbered 50-79 on the line of scrimmage. Team A is not in a scrimmage kick formation, because in this alignment it is not obvious that a kick will be attempted. (Rule 2-16-10) [Cited by 7-1-4-a-2]