[
  header ["header" ]
  block [
    para ["paragraph paragraph paragraph" ]
  ]
  header ["header" ]
  block [
    line ["paragraph  paragraph  paragraph" ]
  ]
  header ["header" ]
  block [
    para ["paragraph paragraph paragraph" ]
  ]
  header ["header" ]
  block [
    line ["paragraph  paragraph  paragraph" ]
  ]
]