\begin{theindex}

  \item alpha, 1
    \subitem beta, 3
      \subsubitem delta, 8
      \subsubitem gamma, 10
    \subitem phi, 5
      \subsubitem rho, 7, 12, 14
      \subsubitem sigma, 6, 12--14

  \indexspace

  \item random text, \bold{2}, 9--11

\end{theindex}