If you look at the second image from the post two entries ago, and wonder what it would look like without the pink faces, wonder no longer: it’s what you see above.
Next, the red polygons are hidden, and this is what is left (you may click these smaller images if you wish to enlarge them).
The green faces are hidden next.
The next step is to remove the pink faces visible in the interior.
Next, removal of the blue faces leaves only the yellow ones left.
The last step: change the color scheme, so as to more easily be able to tell one face from another.
All of this polyhedron-manipulation, I did with Stella 4d, software I consider an indispensable research-tool. It is available at http://www.software3d.com/Stella.php.