granama1, if like me, you are looking for thematic objects to yield the extreme cells you are going up one of my blind alleys. Spotting the names, and one in particular, then google that with thematic, and Wiki reveals everything. A lot of contributors have commented on how satisfying the end game is, and that was beginning to wind me up, but how right they all were. If it helps, the 3 figures are not regular polygons.