trill rtill tirll itrll ritll irtll trlil rtlil tlril ltril rltil lrtil tilrl itlrl tlirl ltirl iltrl litrl riltl irltl rlitl lritl ilrtl lirtl trill rtill tirll itrll ritll irtll trlil rtlil tlril ltril rltil lrtil tilrl itlrl tlirl ltirl iltrl litrl riltl irltl rlitl lritl ilrtl lirtl trlli rtlli tlrli ltrli rltli lrtli trlli rtlli tlrli ltrli rltli lrtli tllri ltlri tllri ltlri lltri lltri rllti lrlti rllti lrlti llrti llrti tillr itllr tlilr ltilr iltlr litlr tillr itllr tlilr ltilr iltlr litlr tllir ltlir tllir ltlir lltir lltir illtr liltr illtr liltr llitr llitr rillt irllt rlilt lrilt ilrlt lirlt rillt irllt rlilt lrilt ilrlt lirlt rllit lrlit rllit lrlit llrit llrit illrt lilrt illrt lilrt llirt llirt
Note: these 'words' (valid or invalid) are all the permutations of the word trill. These words are obtained by scrambling the letters in trill.