diagonally extended lattice

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**Figure:** T4's can crystallize all by themselves into a periodic lattice. To do so, they join diagonally.
$\begin{figure}\centering\begin{picture}(150,160) \put(0,0){\epsfxsize =150pt \epsffile{t04a.eps}} \end{picture}\end{figure}$

Jose Manuel Gomez Soto 2002-05-15