lurks ulrks lruks rluks urlks rulks lukrs ulkrs lkurs klurs uklrs kulrs lrkus rlkus lkrus klrus rklus krlus urkls rukls ukrls kurls rkuls kruls lursk ulrsk lrusk rlusk urlsk rulsk lusrk ulsrk lsurk slurk uslrk sulrk lrsuk rlsuk lsruk slruk rsluk srluk urslk ruslk usrlk surlk rsulk srulk luksr ulksr lkusr klusr uklsr kulsr luskr ulskr lsukr slukr uslkr sulkr lksur klsur lskur slkur kslur sklur ukslr kuslr usklr suklr ksulr skulr lrksu rlksu lkrsu klrsu rklsu krlsu lrsku rlsku lsrku slrku rslku srlku lksru klsru lskru slkru kslru sklru rkslu krslu rsklu srklu ksrlu skrlu urksl ruksl ukrsl kursl rkusl krusl urskl ruskl usrkl surkl rsukl srukl uksrl kusrl uskrl sukrl ksurl skurl rksul krsul rskul srkul ksrul skrul
Note: these 'words' (valid or invalid) are all the permutations of the word lurks. These words are obtained by scrambling the letters in lurks.