texmath-0.6.7: tests/writers/digit-double-struck.tex
\mathrm{\mathbb{0}\mathbb{1}\mathbb{2}\mathbb{3}\mathbb{4}\mathbb{5}\mathbb{6}\mathbb{7}\mathbb{8}\mathbb{9}}\mathrm{\mathbb{0}\mathbb{1}\mathbb{2}\mathbb{3}\mathbb{4}\mathbb{5}\mathbb{6}\mathbb{7}\mathbb{8}\mathbb{9}}