my Latex and Tex4ht cheat sheet

\documentclass{article}
\input{commonlatex}
\usepackage{tikz}
\newcommand{\MyChair}{
\draw[fill=blue!15,thick] plot coordinates
{(-2,-1)(-2,1)(-1,2)(2,3)(3,2)(3,-2)(2,-3)(-1,-2)};
\draw[fill=blue!15,thick] plot coordinates
{(-2.5,-1)(-2.5,1)(-3.25,2)(-3.25,-2)};
}
\begin{document}
\begin{tikzpicture} [scale=0.125,smooth cycle]
\foreach \row in {1,2,...,10}
{
\foreach \col in {1,2,...,4}
{
\begin{scope}[xshift=\row cm,yshift=\col 10 cm]
\MyChair
\end{scope}
}
}
\end{tikzpicture}
\end{document}
4.7 How to make aligned math inside a node?
see http://tex.stackexchange.com/questions/1342/aligned-equations-inside-of-tikz-node
4.8 trees with tikz?
1. examples http://mvngu.wordpress.com/2011/03/31/typeset-trees-using-tikzpgf/
4.9 more tikz examples
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