| Level | Code |
|---|---|
| Level 1-1-1 | ALKL |
| Level 1-1-2 | ILKL |
| Level 1-1-3 | AJLL |
| Level 2-1-1 | KJKLE |
| Level 2-1-2 | KBMLE |
| Level 2-1-3 | KJMLE |
| Level 2-1-4 | KBKME |
| Level 3-1-1 | ILKLMN |
| Level 3-1-2 | ILCNMN |
| Level 3-1-3 | ILKNMN |
| Level 3-2-2 | KDENMF |
| Level 3-2-3 | KDMNMF |
| Level 4-1-1 | IBKEONO |
| Level 4-1-3 | IBKMONO |
| Level 4-1-4 | IBKEMOO |
| Level 5-1-1 | IJKLNNOP |
| Level 5-1-2 | IJKLFPOP |
| Level 5-2-2 | IBMDHPOP |
| Level 5-2-3 | IBMDPPOP |
| Level 5-2-4 | IBMDHNPP |
| Level 6-2-1 | IBEFGQOPQ |
| Level 6-2-2 | IBEFGIQPQ |