Codewords
  Level  2: CFBMGM
  Level  3: DFBMHM
  Level  4: FFBMJM
  Level  5: GFBMKM
  Level  6: HFBMLM
  Level  7: JFBMMM
  Level  8: KFBMNM
  Level  9: LFBMPM
  Level 10: MFBMRM
  Level 11: NFBMTM
  Level 12: PFBMVM
  Level 13: RFBMWM

Codewords by Martin Strohmeier - Martin.Strohmeier@t-online.de