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@@ -2,11 +2,10 @@
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\usepackage[pdftex,active,tightpage]{preview}
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\setlength\PreviewBorder{2mm}
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\usepackage{tikz}
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-\usetikzlibrary{arrows,positioning,fit,shapes}
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\begin{document}
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\begin{preview}
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-\begin{tikzpicture}[scale=1,node distance=2.0cm]
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+\begin{tikzpicture}
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\node (Z) at (0,0) {$Z$};
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\node (Y) at (3,0) {$Y$};
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\node (X) at (1.5,-1.5) {$X$};
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