\@addtocsec{htoc}{1}{-1}{\@print{Chapter 1}\quad{}Combinatorics (section 3.2\ldots{}3.5)} \@addtocsec{htoc}{2}{0}{\@print{1.1}\quad{}Introduction} \@addtocsec{htoc}{3}{0}{\@print{1.2}\quad{}Counting} \@addtocsec{htoc}{4}{1}{\@print{1.2.1}\quad{}Preliminaries} \@addtocsec{htoc}{5}{1}{\@print{1.2.2}\quad{}The addition principle} \@addtocsec{htoc}{6}{1}{\@print{1.2.3}\quad{}The multiplication principle} \@addtocsec{htoc}{7}{1}{\@print{1.2.4}\quad{}Decision trees} \@addtocsec{htoc}{8}{1}{\@print{1.2.5}\quad{}Combining those principles together} \@addtocsec{htoc}{9}{1}{\@print{1.2.6}\quad{}Principle of Inclusion and Exclusion} \@addtocsec{htoc}{10}{1}{\@print{1.2.7}\quad{}Pigeon Hole principle} \@addtocsec{htoc}{11}{1}{\@print{1.2.8}\quad{}Permutations: sequences without repetitions} \@addtocsec{htoc}{12}{1}{\@print{1.2.9}\quad{}Combinations} \@addtocsec{htoc}{13}{1}{\@print{1.2.10}\quad{}Combinations with repetitions} \@addtocsec{htoc}{14}{1}{\@print{1.2.11}\quad{}Summary} \@addtocsec{htoc}{15}{0}{\@print{1.3}\quad{}Properties of binomial coefficients; Combinatorial proofs } \@addtocsec{htoc}{16}{1}{\@print{1.3.1}\quad{}The binomial theorem} \@addtocsec{htoc}{17}{0}{\@print{1.4}\quad{}Conclusion}