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\begin{scope}[node distance=0.75cm]
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\node (FGX) [inner xsep=0.01cm, inner ysep=0.03cm]
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at (0, 0) {@};
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\node (FG) [xshift=0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=FGX, left of=FGX]
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{@};
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\node (X) [xshift=-0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=FGX, right of=FGX]
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{x};
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\node (F) [xshift=0.25cm, inner xsep=0.04cm, inner ysep=0.05cm, below of=FG, left of=FG, xshift=2]
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{f};
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\node (G) [xshift=-0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=FG, right of=FG, xshift=-2]
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{g};
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\draw[->] (FGX) to (X);
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\draw[->] (FGX) to (FG);
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\draw[->] (FG) to (F.north east);
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\draw[->] (FG) to (G.north west);
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\node (Stk0) [draw, shape=rectangle, minimum width=1.5cm, minimum height=0.75cm, anchor=center]
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at (-2.75, 0) {};
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\node (Stk1) [draw, shape=rectangle, minimum width=1.5cm, minimum height=0.75cm, anchor=center]
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at (-2.75, -0.75) {};
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\node (Stk2) [draw, shape=rectangle, minimum width=1.5cm, minimum height=0.75cm, anchor=center]
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at (-2.75, -1.5) {};
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\node (Stk3) [draw, shape=rectangle, minimum width=1.5cm, minimum height=0.75cm, anchor=center]
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at (-2.75, -2.25) {};
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\draw[->] (Stk0.center) to (FGX);
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\draw[->] (Stk1.center) to (FG);
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\draw[->] (Stk2.center) to (F);
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\draw[->] (Stk3.center) to (0.5cm, -2.25cm) -- (X);
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\end{scope}
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