| Level | Code |
|---|---|
| Level 2 | AAJIHGDDC |
| Level 3 | CGGHDGGDG |
| Level 4 | HDICICCII |
| Level 5 | IDHEHDGCC |
| Level 6 | IJIIDIHEC |
| Level 7 | CFDFEFEFJ |
| Level 8 | JIIJIIIIC |
| Level 9 | AAAABAAAA |
| Level 10 | CCGDGBBBB |
| Level 11 | HHIAAJJIG |
| Level 12 | GGDDJJHFD |
| Level 13 | JIECBFGFF |
| Level 14 | HGGEDDCCB |
| Level 15 | HHHGFGDCC |
| Level 16 bis 18 | IHDCHGHFF |