\begin{scope}[node distance=0.75cm]
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\node (KGX)
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[xshift=-0.55cm, inner xsep=0.01cm, inner ysep=0.03cm]
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at (0, 0) {@};
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\node (K)
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[xshift=0.25cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=KGX, left of=KGX]
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{K};
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\node (GX)
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[xshift=-0.45cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=KGX, right of=KGX]
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{@};
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\node (G)
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[xshift=0.45cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=GX, left of=GX]
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{g};
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\node (X)
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[xshift=-0.45cm, inner xsep=0.01cm, inner ysep=0.03cm, below of=GX, right of=GX]
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{x};
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\draw[->] (KGX) to (K);
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\draw[->] (KGX) to (GX);
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\draw[->] (GX) to (G);
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\draw[->] (GX) to (X);
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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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\draw[->] (Stk0.center) to (KGX);
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\end{scope}
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