Level  Easy     Medium   Hard
-----------------------------------
   2    SDFLMSF  VLXCZVF  CJSDPSF
   3    DVLFDZM  DPSDCVX  CMSDKCD
   4    VFDSGPD  ZMGFSCM  SPFPWLD
   5    CSDJKFD  HWKLFYS  TPDFQGB