lower alpha

1. level 0
2. level 0
   1. level 1
   2. level 1
      1. level 2
      2. level 2
   3. level 1
   4. level 1
3. level 0
4. level 0

roman numerals

1. level 0
2. level 0
   1. level 1
   2. level 1
      1. level 2
      2. level 2
   3. level 1
   4. level 1
3. level 0
4. level 0