Simple order list:
  1. First line
  2. Second line
  3. Last line...

Nested order list item (level 2):
  1. Level 1 : First line
    1. Level 2 : First line
    2. Level 2 : Second line
  2. Level 1 : Last line...
Nested order list item (level 5):
  1. Level 1 : First line
    1. Level 2 : First line
    2. Level 2 : Second line
      1. Level 3 : First line
          1. Level 5 : First line
          2. Level 5 : Second line
        1. Level 4 : First line
        2. Level 4 : Second line
      2. Level 3 : Second line
  2. Level 1 : Last line...