Question about Spyderco Triangle Sharpmaker Sharpening Set

The sharpening system offers pre-set fixed angles, including a 40-degree angle (20 degrees per side) for a very sharp edge, a 30-degree angle (15 degrees per side) for sharpening back bevels or thinner blades, and a 12-degree angle for scissors.These include a 30-degree angle (15 degrees per side) for sharpening back bevels or thinner blades, and a 12-degree angle for scissors. These angles are built into the base and cannot be adjusted manually, but you can choose between these predefined angles by inserting the stones into the corresponding slots. The base is designed to guarantee these precise angles when sharpening.

How many angles are available?