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Here is one possible way to draw your diagram. The AMScd package doesn't seem to support longer arrows, so 7 has to make quite an detour. $\require{AMScd}$

\begin{CD} 7 @= 7 @= 7 @= 7\\ @| @. @. @AyAA\\ 7 @. @. 1 @>x>> 2 @>y>>8\\ @VxVV @. @AxAA @VxVV @VyVV\\ 6 @>x>> 5 @<y<< 4 @<x<< 3 @. 9\\ @VyVV @. @. @VyVV @VxVV\\ 14 @<x<< 13 @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

For a guide to drawing these, see this MSE meta answer. To see the source code, right click over the diagram and choose "Show Math As" > "TeX Commands" or click the edit button to see the source of the whole post.

Edit: Here is another version of the diagram with "fake" long arrows but without the equal signs. Long arrows produced this way look silly enough as is, so I didn't want to make them with corners.

\begin{CD} 14 @<y<< 6 @<x<< - @<<< 7\\ @AAA @VVV @. @AyAA\\ | @. | @. 1 @>x>> 2 @>y>>8\\ @AxAA @VxVV @AxAA @VxVV @VyVV\\ | @. 5 @<y<< 4 @<x<< 3 @. 9\\ @AAA @. @. @VyVV @VxVV\\ 13 @>>> - @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

Here is one possible way to draw your diagram. The AMScd package doesn't seem to support longer arrows, so 7 has to make quite an detour. $\require{AMScd}$

\begin{CD} 7 @= 7 @= 7 @= 7\\ @| @. @. @AyAA\\ 7 @. @. 1 @>x>> 2 @>y>>8\\ @VxVV @. @AxAA @VxVV @VyVV\\ 6 @>x>> 5 @<y<< 4 @<x<< 3 @. 9\\ @VyVV @. @. @VyVV @VxVV\\ 14 @<x<< 13 @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

For a guide to drawing these, see this MSE meta answer. To see the source code, right click over the diagram and choose "Show Math As" > "TeX Commands" or click the edit button to see the source of the whole post.

Edit: Here is another version of the diagram with "fake" long arrows but without the equal signs. Long arrows produced this way look silly enough as is, so I didn't want to make them with corners.

\begin{CD} 14 @<y<< 6 @<x<< - @<<< 7\\ @AAA @VVV @. @AyAA\\ | @. | @. 1 @>x>> 2 @>y>>8\\ @AxAA @VxVV @AxAA @VxVV @VyVV\\ | @. 5 @<y<< 4 @<x<< 3 @. 9\\ @AAA @. @. @VyVV @VxVV\\ 13 @>>> - @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

Here is one possible way to draw your diagram. The AMScd package doesn't seem to support longer arrows, so 7 has to make quite an Odyssey. $\require{AMScd}$

\begin{CD} 7 @= 7 @= 7 @= 7\\ @| @. @. @AyAA\\ 7 @. @. 1 @>x>> 2 @>y>>8\\ @VxVV @. @AxAA @VxVV @VyVV\\ 6 @>x>> 5 @<y<< 4 @<x<< 3 @. 9\\ @VyVV @. @. @VyVV @VxVV\\ 14 @<x<< 13 @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

For a guide to drawing these, see this MSE meta answer. To see the source code, right click over the diagram and choose "Show Math As" > "TeX Commands" or click the edit button to see the source of the whole post.

Edit: Here is another version of the diagram with "fake" long arrows but without the equal signs. Long arrows produced this way look silly enough as is, so I didn't want to make long arrows with corners.

\begin{CD} 14 @<y<< 6 @<x<< - @<<< 7\\ @AAA @VVV @. @AyAA\\ | @. | @. 1 @>x>> 2 @>y>>8\\ @AxAA @VxVV @AxAA @VxVV @VyVV\\ | @. 5 @<y<< 4 @<x<< 3 @. 9\\ @AAA @. @. @VyVV @VxVV\\ 13 @>>> - @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

Here is one possible way to draw your diagram. The AMScd package doesn't seem to support longer arrows, so 7 has to make quite an detour. $\require{AMScd}$

\begin{CD} 7 @= 7 @= 7 @= 7\\ @| @. @. @AyAA\\ 7 @. @. 1 @>x>> 2 @>y>>8\\ @VxVV @. @AxAA @VxVV @VyVV\\ 6 @>x>> 5 @<y<< 4 @<x<< 3 @. 9\\ @VyVV @. @. @VyVV @VxVV\\ 14 @<x<< 13 @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

For a guide to drawing these, see this MSE meta answer. To see the source code, right click over the diagram and choose "Show Math As" > "TeX Commands" or click the edit button to see the source of the whole post.

Edit: Here is another version of the diagram with "fake" long arrows but without the equal signs. Long arrows produced this way look silly enough as is, so I didn't want to make them with corners.

\begin{CD} 14 @<y<< 6 @<x<< - @<<< 7\\ @AAA @VVV @. @AyAA\\ | @. | @. 1 @>x>> 2 @>y>>8\\ @AxAA @VxVV @AxAA @VxVV @VyVV\\ | @. 5 @<y<< 4 @<x<< 3 @. 9\\ @AAA @. @. @VyVV @VxVV\\ 13 @>>> - @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

Here is one possible way to draw your diagram. The AMScd package doesn't seem to support longer arrows, so 7 has to make quite an Odyssey. $\require{AMScd}$

\begin{CD} 7 @= 7 @= 7 @= 7\\ @| @. @. @AyAA\\ 7 @. @. 1 @>x>> 2 @>y>>8\\ @VxVV @. @AxAA @VxVV @VyVV\\ 6 @>x>> 5 @<y<< 4 @<x<< 3 @. 9\\ @VyVV @. @. @VyVV @VxVV\\ 14 @<x<< 13 @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

For a guide to drawing these, see this MSE meta answer. To see the source code, right click over the diagram and choose "Show Math As" > "TeX Commands" or click the edit button to see the source of the whole post.

Here is one possible way to draw your diagram. The AMScd package doesn't seem to support longer arrows, so 7 has to make quite an Odyssey. $\require{AMScd}$

\begin{CD} 7 @= 7 @= 7 @= 7\\ @| @. @. @AyAA\\ 7 @. @. 1 @>x>> 2 @>y>>8\\ @VxVV @. @AxAA @VxVV @VyVV\\ 6 @>x>> 5 @<y<< 4 @<x<< 3 @. 9\\ @VyVV @. @. @VyVV @VxVV\\ 14 @<x<< 13 @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}

For a guide to drawing these, see this MSE meta answer. To see the source code, right click over the diagram and choose "Show Math As" > "TeX Commands" or click the edit button to see the source of the whole post.

Edit: Here is another version of the diagram with "fake" long arrows but without the equal signs. Long arrows produced this way look silly enough as is, so I didn't want to make long arrows with corners.

\begin{CD} 14 @<y<< 6 @<x<< - @<<< 7\\ @AAA @VVV @. @AyAA\\ | @. | @. 1 @>x>> 2 @>y>>8\\ @AxAA @VxVV @AxAA @VxVV @VyVV\\ | @. 5 @<y<< 4 @<x<< 3 @. 9\\ @AAA @. @. @VyVV @VxVV\\ 13 @>>> - @>y>> 12 @>x>> 11 @>y>> 10 \end{CD}