<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">$$
\let\^\widehat \let\~\widetilde
\flexible \columndist=1cm
\xgrid+=2mm \ygrid+=-2mm
\Diagram
      &amp;         &amp;         &amp;        &amp;H^0 \bTo(-1,-4) \hx{-2pt}
                                          &amp;\cdots&amp;H^{n-1}  &amp;H^n  &amp;H^{n+1}&amp;H^{n+2} &amp;\cdots   \\
\mx{5mm}&amp;       &amp;         &amp;        &amp;\dTo  &amp;      &amp;\dTo     &amp;\dEpi&amp;\dBar  &amp;\dBar   &amp;\mx{-2mm}\\
\cdots&amp;\^H^{-3} &amp;\^H^{-2} &amp;\^H^{-1}&amp;\^H^0 &amp;\cdots&amp;\^H^{n-1}&amp;\^H^n&amp;\^H^{n+1}&amp;\^H^{n+2}&amp;\cdots\\
      &amp;\dBar    &amp;\dBar    &amp;\dInto  &amp;\dTo  &amp;      &amp;\dTo \dx{-2mm}                            \\
\cdots&amp;\~H_{n+2}&amp;\~H_{n+1}&amp;\~H_n&amp;\~H_{n-1}&amp;\cdots&amp;\~H_0 \aTo(1,4) \hx{-2pt}                 \\
\endDiagram
$$
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