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\end{cases}</math>
\end{cases}</math>
f(n) =
<math>f(n) =
\begin{cases}
\begin{cases}
n/2, & \mbox{if }n\mbox{ is even} \\
n/2, & \mbox{if }n\mbox{ is even} \\
3n+1, & \mbox{if }n\mbox{ is odd}
3n+1, & \mbox{if }n\mbox{ is odd}
\end{cases}
\end{cases}</math>