hytb yhtb htyb thyb ythb tyhb hybt yhbt hbyt bhyt ybht byht htby thby hbty bhty tbhy bthy ytbh tybh ybth byth tbyh btyh
Note: these 'words' (valid or invalid) are all the permutations of the word hytb. These words are obtained by scrambling the letters in hytb.