When using both arms, there are a total of 64 positions. These can be divided into four quadrants.
In Quadrant 1 both arms are horizontal.
In Quadrant 2 both arms are vertical
In quadrants 3 and 4 one arm is vertical and the other is horizontal.
This is a 3rd quadrant position, since one arm is horizontal and the other is horizontal.
Note that when using both arms, positions (and movements) are read from left to right.