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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