$$\begin{aligned} \begin{array}{cc|c|c|c|}
* && e & r & r^2& r^3& r^4& r^5& r^6& r^7& r^8& r^9& r^{10}& r^{11}\\
&&&&\\
\hline
e && & & \\
\hline
f && & & \\
\hline
rf && & & \\
\hline
r^2f && & & \\
\hline
r^3f && & & \\
\hline
r^4f && & & \\
\hline
r^5f && & & \\
\hline
r^6f && & & \\
\hline
r^7f && & & \\
\hline
r^8f && & & \\
\hline
r^9f && & & \\
\hline
r^{10}f && & & \\
\hline
r^{11}f && & & \\
\hline
\end{array} \end{aligned}$$