{ context, core, ... }:
let
  inherit(core) indentation;

  debug                                 =   core.debug ( context ++  [ "mainMatter" ] );
in
  { ... }:
  mainmatter:
  (
    [
      "{" indentation.more
      "\\cleardoublepage"
      "\\renewcommand*\\chapterpagestyle{scrheadings}"
      "\\pagestyle{scrheadings}"
      "\\pagenumbering{arabic}"
    ]
    ++  mainmatter
    ++  [ indentation.less "}" ]
  )