<li><a href="http://www.geom.uiuc.edu/software/download/kali.html">kali</a>
to discover symmetry groups (the so-called wallpapers and frieze
<li><a href="http://www.geom.uiuc.edu/software/download/kali.html">kali</a>
to discover symmetry groups (the so-called wallpapers and frieze