Level  2  :: FTGHJ
Level  3  :: QRTHJ
Level  4  :: ANJZU
Level  5  :: XHNJK
Level  6  :: SLOPZ
Level  7  :: EHGTZ
Level  8  :: DOUTZ
Level  9  :: CQQW
Level 10  :: BSDG
Level 11  :: TIUI
Level 12  :: HQMD
Level 13  :: NDDD
Level 14  :: JSLO
Level 15  :: MMSE
Level 16  :: KLVF
Level 17  :: ISDD
Level 18  :: OEFF
Level 19  :: LSEE
Level 20  :: YYVD