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$$
\let\^\widehat \let\~\widetilde
\flexible \columndist=1cm
\xgrid+=2mm \ygrid+=-2mm
\Diagram
& & & &H^0 \bTo(-1,-4) \hx{-2pt}
&\cdots &H^{n-1} &H^n &H^{n+1} &H^{n+2} &\cdots \\
\mx{5mm}& & & &\dTo & &\dTo &\dEpi&\dBar &\dBar &\mx{-2mm}\\
\cdots &\^H^{-3} &\^H^{-2} &\^H^{-1}&\^H^0 &\cdots &\^H^{n-1}&\^H^n&\^H^{n+1}&\^H^{n+2}&\cdots\\
&\dBar &\dBar &\dInto &\dTo & &\dTo \dx{-2mm} \\
\cdots &\~H_{n+2}&\~H_{n+1}&\~H_n &\~H_{n-1}&\cdots&\~H_0 \aTo(1,4) \hx{-2pt} \\
\endDiagram
$$
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