www.neutreeko.net Neutreeko Publications and preprints D.Phil. thesis M.Sc. thesis Dissection puzzles Colouring the hex grid   Regular polyhedron surface tours   Cubic graphs of high girth Unit distance graphs   Some material on the game of Y   Non-colliding cars (based on hexastix) Stupid puzzle (just for fun) E-mail address: admin[at]neutreeko.net Last modified 14.06.2026 by Jan Kristian Haugland