\BOOKMARK [1][-]{section.1}{Introduction: drunken walks}{}% 1
\BOOKMARK [1][-]{section.2}{Enumeration: Touchard's identity}{}% 2
\BOOKMARK [1][-]{section.3}{Bijection: Dyck paths}{}% 3
\BOOKMARK [1][-]{section.4}{Extension: more dimensions}{}% 4
\BOOKMARK [1][-]{section.5}{Restriction: three dimensions}{}% 5
\BOOKMARK [2][-]{subsection.5.1}{Acknowledgments}{section.5}% 6