11. In polyhedral combinatorics, used the Haj�s construction to generate stable set polytope. 12. The symmetry number of a polyhedral prism is twice that of the base polyhedron. 13. Coffin has designed more than 500 original puzzles, most of which are polyhedral . 14. In particular, the ions occupy the interstitial spaces defined by the polyhedral frameworks. 15. In 2007, Mosely began designing origami-like polyhedral models using egg cartons. 16. It allows the approximation of elliptic problems using a large class of polyhedral meshes. 17. The fact that there is source code for generating various polyhedral shapes is irrelevant. 18. He termed this new structure multiple polyhedral . 19. Remove one face of the polyhedral surface. 20. Cytotrophoblasts are polyhedral , mononuclear cells with hyperchromatic nuclei and a clear or pale cytoplasm.