Codewords:

Level 1 : FWKQCJK   SUZFJVM       Level 16: VDGQWSX   FUMTNWW
Level 2 : TWXZKRM   BNLDXUZ       Level 17: QGNLNFM   VVDRGWD
Level 3 : JPJXFUM   FNGWLWW       Level 18: DNPFNQR1  SRXBPPU
Level 4 : KTJGTSK   RWTKQBK       Level 19: FQKKFHL   GRZHRPP
Level 5 : HGNNNPX   GGVQQDZ       Level 20: RMHOGBX   XTMWFLP
Level 6 : MLLBCPQ   RTWHNTC       Level 21: ZBXLWZK   FMLTVPM
Level 7 : XBVCKLL   FBMBPFO       Level 22: HTLDXLB   KSGVVWK
Level 8 : JWGKQPH   GTGCDKO       Level 23: ZDGHTWD   ZBPBXCT
Level 9 : JJGKBBH   KSRXKVK       Level 24: CFHXPSM   WHCHBQW
Level 10: JJGKQPH   TBHLCRC       Level 25: PZBXCXB   LHDPGNN
Level 11: GGWWFXR   XVJKXBQ       Level 26: CWLGDBC   HVLXXTH
Level 12: PPTDZZG   TMRSZMF       Level 27: WDNLSMJ   STVNDPK
Level 13: TPVSDSC   CVSDHLF       Level 28: WDZWWCB   JFTQVSX
Level 14: QSPRKMK   WXLBGBP       Level 29: WXBRTMV   SKKWSZZ
Level 15: BXCHLQS   WZNFLWF

Codewords by Arne Beilschmidt - Beilschmidt@T-Online.de