---input---
- [ ] sample task

* [ ] sample task

  * [ ] sample task

---tokens---
'- '          Keyword
'[ ]'         Keyword
' '           Text
'sample'      Text
' '           Text
'task'        Text
'\n'          Text

'\n'          Text

'* '          Keyword
'[ ]'         Keyword
' '           Text
'sample'      Text
' '           Text
'task'        Text
'\n'          Text

'\n  '        Text
'* '          Keyword
'[ ]'         Keyword
' '           Text
'sample'      Text
' '           Text
'task'        Text
'\n'          Text
