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