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](http://meta.math.stackexchange.com/a/16888/166535).
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.