I'm going with 10-4-6
The basic spot is the 20-yard line for fouls by either team when the opponent of the team in possession at the time of the foul is responsible for forcing the ball across the goal line of the team in possession, and the related run ends in the end zone and is followed by a loose ball, regardless of where the loose ball becomes dead.
The penalty for the illegal block below the waist (9-3-2) is enforced from the B20, half the distance to the goal. 1st and 10 for B at the B10.
The basic spot is the 20-yard line for fouls by either team when the opponent of the team in possession at the time of the foul is responsible for forcing the ball across the goal line of the team in possession, and the related run ends in the end zone and is followed by a loose ball, regardless of where the loose ball becomes dead.
The penalty for the illegal block below the waist (9-3-2) is enforced from the B20, half the distance to the goal. 1st and 10 for B at the B10.