\catcode `\@=11\relax 
\ZZ {Introduction}{1}{1}{1}
\ZZ {Parsing and preparation}{1}{2}{2}
\ZZ {Diagnostic routines}{1}{16}{6}
\ZZ {Overview of the algorithm}{1}{21}{8}
\ZZ {Doing it}{1}{29}{11}
\ZZ {A loopless version}{1}{32}{12}
\ZZ {Index}{1}{33}{13}

\catcode `\@=12\relax