Extrude a profile curve or single-face surface as a slab.

Input parameters:

1. Pr → Slab profile curve or face. The profile must be planar and closed.
2. Z+ → Extrusion height above the profile.
3. Z- → Extrusion height below the profile.
4. O+ → Slab offset distance above the profile.
5. O- → Slab offset distance below the profile.

Output parameters:

1. Sf → Slab-like extrusion surface.