periodic lattice component

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**Figure 5:** T4's can crystallize all by themselves into a periodic lattice. To do so, they join diagonally.
$\begin{figure} \centering \begin{picture} (150,160) \put(0,0){\epsfxsize=150pt \epsffile{t04a.eps}} \end{picture} \end{figure}$

**Figure 6:** T4's can also combine with other small triangles to form crystal lattices, or even aperiodic ones when the joining rules are sufficiently flexible.
$\begin{figure} \centering \begin{picture} (280,160) \put(0,0){\epsfxsize=130pt \... ...s}} \put(150,0){\epsfxsize=130pt \epsffile{t04c.eps}} \end{picture} \end{figure}$

**Figure 7:** T4's can participate in many other lattices.
$\begin{figure} \centering \begin{picture} (150,190) \put(0,0){\epsfxsize=150pt \epsffile{latt4a.eps}} \end{picture} \end{figure}$

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2000-05-22