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0001 \documentclass[a4paper,10pt]{article}
0002 \usepackage[utf8]{inputenc}
0003 \usepackage[pdftex,active,tightpage]{preview}
0004 \usepackage{tikz}
0005 \PreviewEnvironment{tikzpicture}
0006
0007 \begin{document}
0008 \thispagestyle{empty}
0009 \begin{tikzpicture}
0010 \node[draw, circle, fill=yellow] (a) at (0, 0) {a};
0011 \node[draw, rectangle, fill=yellow, ultra thick] (b) at (2, 0.5) {b};
0012 \draw[<->] (a) -- (b);
0013 \end{tikzpicture}
0014 \end{document}
0015