\@addtocsec{htoc}{1}{-1}{\@print{Chapter 1}\quad{}Groups, and other algebraic structures (section 8.1)} \@addtocsec{htoc}{2}{0}{\@print{1.1}\quad{}Introduction} \@addtocsec{htoc}{3}{0}{\@print{1.2}\quad{}Permutations} \@addtocsec{htoc}{4}{1}{\@print{1.2.1}\quad{}Operation on $S_{n}$} \@addtocsec{htoc}{5}{1}{\@print{1.2.2}\quad{}Generators of $S_{n}$} \@addtocsec{htoc}{6}{0}{\@print{1.3}\quad{}Groups} \@addtocsec{htoc}{7}{1}{\@print{1.3.1}\quad{}Definitions and examples} \@addtocsec{htoc}{8}{1}{\@print{1.3.2}\quad{}Just some examples of results and questions about groups}