urdell rudell udrell durell rduell druell uredll ruedll uerdll eurdll reudll erudll uderll duerll uedrll eudrll deurll edurll rdeull dreull redull erdull derull edrull urdlel rudlel udrlel durlel rdulel drulel urldel ruldel ulrdel lurdel rludel lrudel udlrel dulrel uldrel ludrel dlurel ldurel rdluel drluel rlduel lrduel dlruel ldruel ureldl rueldl uerldl eurldl reuldl eruldl urledl ruledl ulredl luredl rluedl lruedl uelrdl eulrdl ulerdl luerdl elurdl leurdl reludl erludl rleudl lreudl elrudl lerudl udelrl duelrl uedlrl eudlrl deulrl edulrl udlerl dulerl ulderl luderl dluerl lduerl ueldrl euldrl uledrl luedrl eludrl leudrl delurl edlurl dleurl ldeurl eldurl ledurl rdelul drelul redlul erdlul derlul edrlul rdleul drleul rldeul lrdeul dlreul ldreul reldul erldul rledul lredul elrdul lerdul delrul edlrul dlerul lderul eldrul ledrul urdell rudell udrell durell rduell druell uredll ruedll uerdll eurdll reudll erudll uderll duerll uedrll eudrll deurll edurll rdeull dreull redull erdull derull edrull urdlel rudlel udrlel durlel rdulel drulel urldel ruldel ulrdel lurdel rludel lrudel udlrel dulrel uldrel ludrel dlurel ldurel rdluel drluel rlduel lrduel dlruel ldruel ureldl rueldl uerldl eurldl reuldl eruldl urledl ruledl ulredl luredl rluedl lruedl uelrdl eulrdl ulerdl luerdl elurdl leurdl reludl erludl rleudl lreudl elrudl lerudl udelrl duelrl uedlrl eudlrl deulrl edulrl udlerl dulerl ulderl luderl dluerl lduerl ueldrl euldrl uledrl luedrl eludrl leudrl delurl edlurl dleurl ldeurl eldurl ledurl rdelul drelul redlul erdlul derlul edrlul rdleul drleul rldeul lrdeul dlreul ldreul reldul erldul rledul lredul elrdul lerdul delrul edlrul dlerul lderul eldrul ledrul urdlle rudlle udrlle durlle rdulle drulle urldle ruldle ulrdle lurdle rludle lrudle udlrle dulrle uldrle ludrle dlurle ldurle rdlule drlule rldule lrdule dlrule ldrule urdlle rudlle udrlle durlle rdulle drulle urldle ruldle ulrdle lurdle rludle lrudle udlrle dulrle uldrle ludrle dlurle ldurle rdlule drlule rldule lrdule dlrule ldrule urllde rullde ulrlde lurlde rlulde lrulde urllde rullde ulrlde lurlde rlulde lrulde ullrde lulrde ullrde lulrde llurde llurde rllude lrlude rllude lrlude llrude llrude udllre dullre uldlre ludlre dlulre ldulre udllre dullre uldlre ludlre dlulre ldulre ulldre luldre ulldre luldre lludre lludre dllure ldlure dllure ldlure lldure lldure rdllue drllue rldlue lrdlue dlrlue ldrlue rdllue drllue rldlue lrdlue dlrlue ldrlue rlldue lrldue rlldue lrldue llrdue llrdue dllrue ldlrue dllrue ldlrue lldrue lldrue urelld ruelld uerlld eurlld reulld erulld urleld ruleld ulreld lureld rlueld lrueld uelrld eulrld ulerld luerld elurld leurld reluld erluld rleuld lreuld elruld leruld urelld ruelld uerlld eurlld reulld erulld urleld ruleld ulreld lureld rlueld lrueld uelrld eulrld ulerld luerld elurld leurld reluld erluld rleuld lreuld elruld leruld urlled rulled ulrled lurled rluled lruled urlled rulled ulrled lurled rluled lruled ullred lulred ullred lulred llured llured rllued lrlued rllued lrlued llrued llrued uellrd eullrd ulelrd luelrd elulrd leulrd uellrd eullrd ulelrd luelrd elulrd leulrd ullerd lulerd ullerd lulerd lluerd lluerd ellurd lelurd ellurd lelurd lleurd lleurd rellud erllud rlelud lrelud elrlud lerlud rellud erllud rlelud lrelud elrlud lerlud rlleud lrleud rlleud lrleud llreud llreud ellrud lelrud ellrud lelrud llerud llerud udellr duellr uedllr eudllr deullr edullr udlelr dulelr uldelr ludelr dluelr lduelr ueldlr euldlr uledlr luedlr eludlr leudlr delulr edlulr dleulr ldeulr eldulr ledulr udellr duellr uedllr eudllr deullr edullr udlelr dulelr uldelr ludelr dluelr lduelr ueldlr euldlr uledlr luedlr eludlr leudlr delulr edlulr dleulr ldeulr eldulr ledulr udller duller uldler ludler dluler lduler udller duller uldler ludler dluler lduler ullder lulder ullder lulder lluder lluder dlluer ldluer dlluer ldluer llduer llduer uelldr eulldr uleldr lueldr eluldr leuldr uelldr eulldr uleldr lueldr eluldr leuldr ulledr luledr ulledr luledr lluedr lluedr elludr leludr elludr leludr lleudr lleudr dellur edllur dlelur ldelur eldlur ledlur dellur edllur dlelur ldelur eldlur ledlur dlleur ldleur dlleur ldleur lldeur lldeur elldur leldur elldur leldur lledur lledur rdellu drellu redllu erdllu derllu edrllu rdlelu drlelu rldelu lrdelu dlrelu ldrelu reldlu erldlu rledlu lredlu elrdlu lerdlu delrlu edlrlu dlerlu lderlu eldrlu ledrlu rdellu drellu redllu erdllu derllu edrllu rdlelu drlelu rldelu lrdelu dlrelu ldrelu reldlu erldlu rledlu lredlu elrdlu lerdlu delrlu edlrlu dlerlu lderlu eldrlu ledrlu rdlleu drlleu rldleu lrdleu dlrleu ldrleu rdlleu drlleu rldleu lrdleu dlrleu ldrleu rlldeu lrldeu rlldeu lrldeu llrdeu llrdeu dllreu ldlreu dllreu ldlreu lldreu lldreu relldu erlldu rleldu lreldu elrldu lerldu relldu erlldu rleldu lreldu elrldu lerldu rlledu lrledu rlledu lrledu llredu llredu ellrdu lelrdu ellrdu lelrdu llerdu llerdu dellru edllru dlelru ldelru eldlru ledlru dellru edllru dlelru ldelru eldlru ledlru dlleru ldleru dlleru ldleru llderu llderu elldru leldru elldru leldru lledru lledru
Note: these 'words' (valid or invalid) are all the permutations of the word urdell. These words are obtained by scrambling the letters in urdell.