\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{Coverings, repunits, and the cover-12 method}{}% 2
\BOOKMARK [1][-]{section.3}{A cover-12 example}{}% 3
\BOOKMARK [1][-]{section.4}{Coverings with more congruences}{}% 4
\BOOKMARK [1][-]{section.5}{Starting on the left}{}% 5
\BOOKMARK [1][-]{section.6}{The factorization method}{}% 6
\BOOKMARK [1][-]{section.7}{The next step}{}% 7