pub const TEX_PREAMBLE_START: &str = "%{#preamble}";
pub const TEX_PREAMBLE_END: &str = "%{/preamble}";
pub const TEX_DOC_START: &str = "\\begin{document}";
pub const TEX_DOC_END: &str = "\\end{document}";
pub const TEX_QUESTION_START: &str = "%{#q}";
pub const TEX_QUESTION_END: &str = "%{/q}";
pub const TEX_OPTION_START: &str = "%{#o}";
pub const TEX_OPTION_END: &str = "%{/o}";