Level 1-1 AAAA     Level 3-3 IIII
Level 1-2 BBBB     Level 4-1 JJJJ
Level 1-3 CCCC     Level 4-2 KKKK
Level 2-1 DDDD     Level 4-3 LLLL
Level 2-2 EEEE     Level 5-1 MMMM
Level 2-3 FFFF     Level 5-2 NNNN
Level 3-1 GGGG     Level 5-3 OOOO
Level 3-2 HHHH