skill ksill sikll iskll kisll iksll sklil kslil slkil lskil klsil lksil silkl islkl slikl lsikl ilskl liskl kilsl iklsl klisl lkisl ilksl liksl skill ksill sikll iskll kisll iksll sklil kslil slkil lskil klsil lksil silkl islkl slikl lsikl ilskl liskl kilsl iklsl klisl lkisl ilksl liksl sklli kslli slkli lskli klsli lksli sklli kslli slkli lskli klsli lksli sllki lslki sllki lslki llski llski kllsi lklsi kllsi lklsi llksi llksi sillk isllk slilk lsilk ilslk lislk sillk isllk slilk lsilk ilslk lislk sllik lslik sllik lslik llsik llsik illsk lilsk illsk lilsk llisk llisk kills iklls klils lkils ilkls likls kills iklls klils lkils ilkls likls kllis lklis kllis lklis llkis llkis illks lilks illks lilks lliks lliks
Note: these 'words' (valid or invalid) are all the permutations of the word skill. These words are obtained by scrambling the letters in skill.