fnwo nfwo fwno wfno nwfo wnfo fnow nfow fonw ofnw nofw onfw fwon wfon fown ofwn wofn owfn nwof wnof nowf onwf wonf ownf
Note: these 'words' (valid or invalid) are all the permutations of the word fnwo. These words are obtained by scrambling the letters in fnwo.