thurl hturl tuhrl uthrl hutrl uhtrl thrul htrul trhul rthul hrtul rhtul turhl utrhl truhl rtuhl urthl ruthl hurtl uhrtl hrutl rhutl urhtl ruhtl thulr htulr tuhlr uthlr hutlr uhtlr thlur htlur tlhur lthur hltur lhtur tulhr utlhr tluhr ltuhr ulthr luthr hultr uhltr hlutr lhutr ulhtr luhtr thrlu htrlu trhlu rthlu hrtlu rhtlu thlru htlru tlhru lthru hltru lhtru trlhu rtlhu tlrhu ltrhu rlthu lrthu hrltu rhltu hlrtu lhrtu rlhtu lrhtu turlh utrlh trulh rtulh urtlh rutlh tulrh utlrh tlurh lturh ultrh lutrh trluh rtluh tlruh ltruh rltuh lrtuh urlth rulth ulrth lurth rluth lruth hurlt uhrlt hrult rhult urhlt ruhlt hulrt uhlrt hlurt lhurt ulhrt luhrt hrlut rhlut hlrut lhrut rlhut lrhut urlht rulht ulrht lurht rluht lruht
Note: these 'words' (valid or invalid) are all the permutations of the word thurl. These words are obtained by scrambling the letters in thurl.