\begin{theindex}

  \item bad-encaps, \ii{5--7}

  \indexspace

  \item encap-escape1 aaa@bbb|ccc!ddd"eee{fff}, \ppp{11}, 10--12
  \item encap-escape2, \aaa@bbb|ccc!ddd"eee{fff}{20--22}

  \indexspace

  \item implicit-range, 10--12
  \item incons-encaps, \ii{6}, 5--7
  \item incons-encaps2, \ii{5}, 5
  \item incons-entries, 6, \xx{6}

  \indexspace

  \item missing(, 6
  \item missing), 6
  \item mixed-range, i, 6
  \item mixed-range1, i--iv, 3--6
  \item mixed-range2, \xx{ii}, i--ii, \yy{3--6}

  \indexspace

  \item ok-encaps, \ii{5--7}

\end{theindex}