kpgo pkgo kgpo gkpo pgko gpko kpog pkog kopg okpg pokg opkg kgop gkop kogp okgp gokp ogkp pgok gpok pogk opgk gopk ogpk
Note: these 'words' (valid or invalid) are all the permutations of the word kpgo. These words are obtained by scrambling the letters in kpgo.