1. Item A (type 1, level 0, order 1)
  2. Item B (type 1, level 0, order 2)
    1. Item C (type 1, level 1, order 3)
    2. Item D (type 1, level 1, order 4)
    3. Item E (type 1, level 1, order 5)
      1. Item F (type 1, level 2, order 6)
      2. Item G (type 1, level 2, order 7)
      3. Item H (type 1, level 2, order 8)
    4. Item I (type 1, level 1, order 9)
    5. Item J (type 1, level 1, order 10)
  3. Item K (type 1, level 0, order 11)
  4. Item L (type 1, level 0, order 12)
  1. Item M (type 2, level 0, order 13)
  2. Item N
  3. Item O
    1. Item P
    2. Item Q
    3. Item S
  1. Item T (type 3, level 0, order 19)
  2. Item U
  3. Item V
    1. Item X
    2. Item Y
    3. Item Z

Serialised Output (per list)