filks iflks fliks lfiks ilfks lifks fikls ifkls fkils kfils ikfls kifls flkis lfkis fklis kflis lkfis klfis ilkfs likfs iklfs kilfs lkifs klifs filsk iflsk flisk lfisk ilfsk lifsk fislk ifslk fsilk sfilk isflk siflk flsik lfsik fslik sflik lsfik slfik ilsfk lisfk islfk silfk lsifk slifk fiksl ifksl fkisl kfisl ikfsl kifsl fiskl ifskl fsikl sfikl isfkl sifkl fksil kfsil fskil sfkil ksfil skfil iksfl kisfl iskfl sikfl ksifl skifl flksi lfksi fklsi kflsi lkfsi klfsi flski lfski fslki sflki lsfki slfki fksli kfsli fskli sfkli ksfli skfli lksfi klsfi lskfi slkfi kslfi sklfi ilksf liksf iklsf kilsf lkisf klisf ilskf liskf islkf silkf lsikf slikf ikslf kislf isklf siklf ksilf skilf lksif klsif lskif slkif kslif sklif
Note: these 'words' (valid or invalid) are all the permutations of the word filks. These words are obtained by scrambling the letters in filks.