Extract the twelve edges of a box.

Input parameters:

1. Bx → Box for edge line extraction.

Output parameters:

1. x-- → Edge in the X direction.
2. x+- → Edge in the X direction.
3. x-+ → Edge in the X direction.
4. x++ → Edge in the X direction.
5. y-- → Edge in the Y direction.
6. y+- → Edge in the Y direction.
7. y-+ → Edge in the Y direction.
8. y++ → Edge in the Y direction.
9. z-- → Edge in the Z direction.
10. z+- → Edge in the Z direction.
11. z-+ → Edge in the Z direction.
12. z++ → Edge in the Z direction.