hefm ehfm hfem fhem efhm fehm hemf ehmf hmef mhef emhf mehf hfme fhme hmfe mhfe fmhe mfhe efmh femh emfh mefh fmeh mfeh
Note: these 'words' (valid or invalid) are all the permutations of the word hefm. These words are obtained by scrambling the letters in hefm.