skoff ksoff sokff oskff kosff oksff skfof ksfof sfkof fskof kfsof fksof sofkf osfkf sfokf fsokf ofskf foskf kofsf okfsf kfosf fkosf ofksf foksf skoff ksoff sokff oskff kosff oksff skfof ksfof sfkof fskof kfsof fksof sofkf osfkf sfokf fsokf ofskf foskf kofsf okfsf kfosf fkosf ofksf foksf skffo ksffo sfkfo fskfo kfsfo fksfo skffo ksffo sfkfo fskfo kfsfo fksfo sffko fsfko sffko fsfko ffsko ffsko kffso fkfso kffso fkfso ffkso ffkso soffk osffk sfofk fsofk ofsfk fosfk soffk osffk sfofk fsofk ofsfk fosfk sffok fsfok sffok fsfok ffsok ffsok offsk fofsk offsk fofsk ffosk ffosk koffs okffs kfofs fkofs ofkfs fokfs koffs okffs kfofs fkofs ofkfs fokfs kffos fkfos kffos fkfos ffkos ffkos offks fofks offks fofks ffoks ffoks
Note: these 'words' (valid or invalid) are all the permutations of the word skoff. These words are obtained by scrambling the letters in skoff.