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\begin{tikzpicture}[
plant/.style = {
draw, thick,
minimum width = 1cm,
minimum height = 1cm,
},
arrow/.style = {
-latex, thick,
},
]
\matrix [row sep = 4mm, nodes={plant}] {
\node [fill=red!10] (U) {$\Delta$}; \\
\node [fill=blue!10] (G) {$G$}; \\
\node [fill=green!10] (K) {$K$}; \\
};
\coordinate (Uz) at (U.west);
\coordinate (Uv) at (U.east);
\coordinate (Gz) at ($(G.north west) - (0, 2mm)$);
\coordinate (Ge) at (G.west);
\coordinate (Gy) at ($(G.south west) + (0, 2mm)$);
\coordinate (Gv) at ($(G.north east) - (0, 2mm)$);
\coordinate (Gw) at (G.east);
\coordinate (Gu) at ($(G.south east) + (0, 2mm)$);
\coordinate (Ky) at (K.west);
\coordinate (Ku) at (K.east);
\begin{scope}[arrow]
\draw (Gz) -- ++(-1cm, 0) |- (Uz) node[left, pos=.25] {$z$};
\draw (Ge) -- ++(-1cm, 0) -- ++(-5mm, 0) node[left] {$e$};
\draw (Gy) -- ++(-1cm, 0) |- (Ky) node[left, pos=.25] {$y$};
\draw (Uv) -- ++(1cm, 0) |- (Gv) node[right, pos=.25] {$v$};
\draw (Gw) ++(15mm, 0) node[right] {$w$} -- (Gw);
\draw (Ku) -- ++(1cm, 0) |- (Gu) node[right, pos=.25] {$u$};
\end{scope}
\end{tikzpicture}
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