\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{Results for the basic version}{}% 2
\BOOKMARK [1][-]{section.3}{Observations on the sequences}{}% 3
\BOOKMARK [1][-]{section.4}{Results for general cases}{}% 4
\BOOKMARK [1][-]{section.5}{Further observations and open questions}{}% 5
\BOOKMARK [1][-]{section.6}{Acknowledgement}{}% 6