\begin{scope}[node distance=0.75cm]
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								\node (DoDo4) [inner xsep=0.01cm, inner ysep=0.03cm] at (0, 0) {@};
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								\node (TimesAp)
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								  [xshift=0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=DoDo4, left of=DoDo4]
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								  {@};
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								\node (Times)
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								  [xshift=0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=TimesAp, left of=TimesAp]
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								  {$+$};
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								\node (Do4) 
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								  [xshift=-0.5cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=DoDo4,
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								  right of=DoDo4, yshift=-0.5cm]
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								  {@};
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								\node (Do_2)
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								  [xshift=0.25cm, inner xsep=0.04cm, inner ysep=0.05cm, below of=Do4, left of=Do4, xshift=2]
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								  {double};
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								\node (4)
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								  [xshift=-0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=Do4, right of=Do4, xshift=-2]
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								  {4};
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								\draw[->] (DoDo4) to (TimesAp);
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								\draw[->] (TimesAp) to (Times);
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								\draw[->] (TimesAp) |- (Do4);
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								\draw[->] (DoDo4) to (Do4);
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								\draw[->] (Do4)  to (Do_2);
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								\draw[->] (Do4)  to (4);
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								\end{scope}
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