[
  itemized [
    item ["level1" ]
    item ["level1" ]
    itemized [
      item ["level2" ]
    ]
  ]
  figure [
    title ["untitled" ]
    verbatim ["level0 pre^/" ]
  ]
  header ["level0" ]
  block [
    itemized [
      item ["level1" ]
      item ["level1" ]
      itemized [
        item ["level2" ]
      ]
    ]
    line ["level0 line" ]
  ]
]