\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{Leaf depths in binary trees}{}% 2
\BOOKMARK [1][-]{section.3}{Main results}{}% 3
\BOOKMARK [1][-]{section.4}{Questions}{}% 4
\BOOKMARK [1][-]{section.5}{Acknowledgments}{}% 5