\begin{tikzcd}[column sep=large, nodes={font=\scriptsize}]
\underline{\mathrm{Ext}}(P; G) \arrow[r, "i"] & \underline{\mathrm{Bitorsrig}}(P, G) \arrow[r, "\delta"] & \underline{\mathrm{Bitorsbirig}}(P, P; G)
\end{tikzcd}

\begin{tikzcd}[column sep=small, row sep=small, nodes={font=\scriptsize}]
& & & \mathrm{I} \arrow[dlll] \arrow[ddlll] \arrow[ddll] \arrow[dddll]\\
\mathrm{II} & & \mathrm{VI} \arrow[d] \arrow[ddl] & \\
\mathrm{III} \arrow[dd] & \mathrm{IV} & \mathrm{VII} \arrow[d] \arrow[dl, dashed] & \\
& \mathrm{V} & \mathrm{VIII} \arrow[dll] & \\
\mathrm{IX} \arrow[ur] & & &
\end{tikzcd}

\begin{tikzcd}[column sep=small, row sep=small, nodes={font=\scriptsize}]
\mathrm{XI} \arrow[d] & & \\
\mathrm{XII} \arrow[d] & & \\
\mathrm{XIII} \arrow[d] \arrow[r] & \mathrm{XIV} \arrow[r, dashed] & \mathrm{XVII} \arrow[d]\\
\mathrm{XV} \arrow[d] & & \mathrm{XVIII} \arrow[ddll]\\
\mathrm{XVI} \arrow[d] & & \\
\mathrm{XIX} & &
\end{tikzcd}