Komorebi Space

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1 \begin{tikzpicture}[x=1cm,y=1cm]
2 \foreach \i/\x in {0/-4.8,1/-1.6,2/1.6,3/4.8}{
3  \node[box,minimum width=1.5cm] (x\i) at (\x,2) {$X_{\i}$};
4  \node[box,minimum width=1.5cm] (y\i) at (\x,0) {$Y_{\i}$};
5  \draw[arr] (x\i) -- node[lab,right] {$f_{\i}$} (y\i);
6 }
7 \foreach \j/\i in {1/0,2/1,3/2}{
8  \draw[arr] (x\j) -- node[lab,above] {$\rho^X_{\i}$} (x\i);
9  \draw[arr] (y\j) -- node[lab,below] {$\rho^Y_{\i}$} (y\i);
10 }
11 \node[lab,text width=12.2cm] at (0,-1.5) {$\partial f_n=\rho^Y_nf_{n+1}-f_n\rho^X_n$\\[5pt] Exactness means every displayed square commutes.};
12 \end{tikzpicture}

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