viff ivff vfif fvif ifvf fivf viff ivff vfif fvif ifvf fivf vffi fvfi vffi fvfi ffvi ffvi iffv fifv iffv fifv ffiv ffiv
Note: these 'words' (valid or invalid) are all the permutations of the word viff. These words are obtained by scrambling the letters in viff.