\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{Definitions and Preliminaries}{}% 2
\BOOKMARK [1][-]{section.3}{Sierpinski's Theorem}{}% 3
\BOOKMARK [1][-]{section.4}{Variations of Sierpinski's Theorem}{}% 4
\BOOKMARK [2][-]{subsection.4.1}{Some Recent Variations}{section.4}% 5
\BOOKMARK [2][-]{subsection.4.2}{Some New Variations}{section.4}% 6
\BOOKMARK [1][-]{section.5}{Acknowledgments}{}% 7