lilts illts llits llits illts lilts litls iltls ltils tlils itlls tills lltis lltis ltlis tllis ltlis tllis iltls litls itlls tills ltils tlils lilst illst llist llist illst lilst lislt ilslt lsilt slilt isllt sillt llsit llsit lslit sllit lslit sllit ilslt lislt isllt sillt lsilt slilt litsl iltsl ltisl tlisl itlsl tilsl listl ilstl lsitl slitl isltl siltl ltsil tlsil lstil sltil tslil stlil itsll tisll istll sitll tsill still lltsi lltsi ltlsi tllsi ltlsi tllsi llsti llsti lslti sllti lslti sllti ltsli tlsli lstli sltli tslli stlli ltsli tlsli lstli sltli tslli stlli iltsl litsl itlsl tilsl ltisl tlisl ilstl listl isltl siltl lsitl slitl itsll tisll istll sitll tsill still ltsil tlsil lstil sltil tslil stlil
Note: these 'words' (valid or invalid) are all the permutations of the word lilts. These words are obtained by scrambling the letters in lilts.