riddle irddle rdidle dridle idrdle dirdle riddle irddle rdidle dridle idrdle dirdle rddile drdile rddile drdile ddrile ddrile iddrle didrle iddrle didrle ddirle ddirle ridlde irdlde rdilde drilde idrlde dirlde rildde irldde rlidde lridde ilrdde lirdde rdlide drlide rldide lrdide dlride ldride idlrde dilrde ildrde lidrde dlirde ldirde ridlde irdlde rdilde drilde idrlde dirlde rildde irldde rlidde lridde ilrdde lirdde rdlide drlide rldide lrdide dlride ldride idlrde dilrde ildrde lidrde dlirde ldirde rddlie drdlie rddlie drdlie ddrlie ddrlie rdldie drldie rlddie lrddie dlrdie ldrdie rdldie drldie rlddie lrddie dlrdie ldrdie ddlrie ddlrie dldrie lddrie dldrie lddrie iddlre didlre iddlre didlre ddilre ddilre idldre dildre ilddre liddre dlidre ldidre idldre dildre ilddre liddre dlidre ldidre ddlire ddlire dldire lddire dldire lddire riddel irddel rdidel dridel idrdel dirdel riddel irddel rdidel dridel idrdel dirdel rddiel drdiel rddiel drdiel ddriel ddriel iddrel didrel iddrel didrel ddirel ddirel ridedl irdedl rdiedl driedl idredl diredl rieddl ireddl reiddl eriddl ierddl eirddl rdeidl dreidl redidl erdidl deridl edridl iderdl dierdl iedrdl eidrdl deirdl edirdl ridedl irdedl rdiedl driedl idredl diredl rieddl ireddl reiddl eriddl ierddl eirddl rdeidl dreidl redidl erdidl deridl edridl iderdl dierdl iedrdl eidrdl deirdl edirdl rddeil drdeil rddeil drdeil ddreil ddreil rdedil dredil reddil erddil derdil edrdil rdedil dredil reddil erddil derdil edrdil dderil dderil dedril eddril dedril eddril idderl diderl idderl diderl ddierl ddierl idedrl diedrl ieddrl eiddrl deidrl edidrl idedrl diedrl ieddrl eiddrl deidrl edidrl ddeirl ddeirl dedirl eddirl dedirl eddirl ridled irdled rdiled driled idrled dirled rilded irlded rlided lrided ilrded lirded rdlied drlied rldied lrdied dlried ldried idlred dilred ildred lidred dlired ldired rideld irdeld rdield drield idreld direld riedld iredld reidld eridld ierdld eirdld rdeild dreild redild erdild derild edrild iderld dierld iedrld eidrld deirld edirld riledd irledd rliedd lriedd ilredd liredd rieldd ireldd reildd erildd ierldd eirldd rleidd lreidd relidd erlidd leridd elridd ilerdd lierdd ielrdd eilrdd leirdd elirdd rdleid drleid rldeid lrdeid dlreid ldreid rdelid drelid redlid erdlid derlid edrlid rledid lredid reldid erldid lerdid elrdid dlerid lderid delrid edlrid ledrid eldrid idlerd dilerd ilderd liderd dlierd ldierd idelrd dielrd iedlrd eidlrd deilrd edilrd iledrd liedrd ieldrd eildrd leidrd elidrd dleird ldeird delird edlird ledird eldird ridled irdled rdiled driled idrled dirled rilded irlded rlided lrided ilrded lirded rdlied drlied rldied lrdied dlried ldried idlred dilred ildred lidred dlired ldired rideld irdeld rdield drield idreld direld riedld iredld reidld eridld ierdld eirdld rdeild dreild redild erdild derild edrild iderld dierld iedrld eidrld deirld edirld riledd irledd rliedd lriedd ilredd liredd rieldd ireldd reildd erildd ierldd eirldd rleidd lreidd relidd erlidd leridd elridd ilerdd lierdd ielrdd eilrdd leirdd elirdd rdleid drleid rldeid lrdeid dlreid ldreid rdelid drelid redlid erdlid derlid edrlid rledid lredid reldid erldid lerdid elrdid dlerid lderid delrid edlrid ledrid eldrid idlerd dilerd ilderd liderd dlierd ldierd idelrd dielrd iedlrd eidlrd deilrd edilrd iledrd liedrd ieldrd eildrd leidrd elidrd dleird ldeird delird edlird ledird eldird rddlei drdlei rddlei drdlei ddrlei ddrlei rdldei drldei rlddei lrddei dlrdei ldrdei rdldei drldei rlddei lrddei dlrdei ldrdei ddlrei ddlrei dldrei lddrei dldrei lddrei rddeli drdeli rddeli drdeli ddreli ddreli rdedli dredli reddli erddli derdli edrdli rdedli dredli reddli erddli derdli edrdli dderli dderli dedrli eddrli dedrli eddrli rdledi drledi rldedi lrdedi dlredi ldredi rdeldi dreldi redldi erdldi derldi edrldi rleddi lreddi relddi erlddi lerddi elrddi dlerdi lderdi delrdi edlrdi ledrdi eldrdi rdledi drledi rldedi lrdedi dlredi ldredi rdeldi dreldi redldi erdldi derldi edrldi rleddi lreddi relddi erlddi lerddi elrddi dlerdi lderdi delrdi edlrdi ledrdi eldrdi ddleri ddleri dlderi ldderi dlderi ldderi ddelri ddelri dedlri eddlri dedlri eddlri dledri ldedri deldri edldri leddri elddri dledri ldedri deldri edldri leddri elddri iddler didler iddler didler ddiler ddiler idlder dilder ildder lidder dlider ldider idlder dilder ildder lidder dlider ldider ddlier ddlier dldier lddier dldier lddier iddelr didelr iddelr didelr ddielr ddielr idedlr diedlr ieddlr eiddlr deidlr edidlr idedlr diedlr ieddlr eiddlr deidlr edidlr ddeilr ddeilr dedilr eddilr dedilr eddilr idledr diledr ildedr lidedr dliedr ldiedr ideldr dieldr iedldr eidldr deildr edildr ileddr lieddr ielddr eilddr leiddr eliddr dleidr ldeidr delidr edlidr ledidr eldidr idledr diledr ildedr lidedr dliedr ldiedr ideldr dieldr iedldr eidldr deildr edildr ileddr lieddr ielddr eilddr leiddr eliddr dleidr ldeidr delidr edlidr ledidr eldidr ddleir ddleir dldeir lddeir dldeir lddeir ddelir ddelir dedlir eddlir dedlir eddlir dledir ldedir deldir edldir leddir elddir dledir ldedir deldir edldir leddir elddir
Note: these 'words' (valid or invalid) are all the permutations of the word riddle. These words are obtained by scrambling the letters in riddle.