\BOOKMARK [1][-]{section.1}{Introduction}{}
\BOOKMARK [1][-]{section.2}{Preliminaries}{}
\BOOKMARK [1][-]{section.3}{Introducing the family of centrally symmetric invertible triangles}{}
\BOOKMARK [1][-]{section.4}{The General Case}{}
\BOOKMARK [1][-]{section.5}{The case r=12}{}
\BOOKMARK [1][-]{section.6}{Conclusion}{}
\BOOKMARK [1][-]{section.7}{Acknowledgments}{}