\documentclass{standalone}
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\usepackage{tikz}
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\usetikzlibrary{graphs, graphdrawing, graphdrawing.trees}
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\begin{document}
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\begin{tikzpicture}
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\graph[tree layout]{
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A -> {B , C}
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};
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\end{tikzpicture}
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\end{document}
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