retial ertial rteial treial etrial terial reital erital rietal iretal eirtal iertal rtieal trieal riteal irteal tireal itreal etiral teiral eitral ietral tieral iteral retail ertail rteail treail etrail terail reatil eratil raetil aretil eartil aertil rtaeil traeil rateil arteil tareil atreil etaril tearil eatril aetril taeril ateril reiatl eriatl rieatl ireatl eiratl ieratl reaitl eraitl raeitl areitl earitl aeritl riaetl iraetl raietl arietl iaretl airetl eiartl ieartl eairtl aeirtl iaertl aiertl rtiael triael ritael irtael tirael itrael rtaiel traiel ratiel artiel tariel atriel riatel iratel raitel aritel iartel airtel tiarel itarel tairel atirel iatrel aitrel etiarl teiarl eitarl ietarl tiearl itearl etairl teairl eatirl aetirl taeirl ateirl eiatrl ieatrl eaitrl aeitrl iaetrl aietrl tiaerl itaerl taierl atierl iaterl aiterl retila ertila rteila treila etrila terila reitla eritla rietla iretla eirtla iertla rtiela triela ritela irtela tirela itrela etirla teirla eitrla ietrla tierla iterla retlia ertlia rtelia trelia etrlia terlia reltia erltia rletia lretia elrtia lertia rtleia trleia rlteia lrteia tlreia ltreia etlria telria eltria letria tleria lteria reilta erilta rielta irelta eirlta ierlta relita erlita rleita lreita elrita lerita rileta irleta rlieta lrieta ilreta lireta eilrta ielrta elirta leirta ilerta lierta rtilea trilea ritlea irtlea tirlea itrlea rtliea trliea rltiea lrtiea tlriea ltriea riltea irltea rlitea lritea ilrtea lirtea tilrea itlrea tlirea ltirea iltrea litrea etilra teilra eitlra ietlra tielra itelra etlira telira eltira letira tleira lteira eiltra ieltra elitra leitra iletra lietra tilera itlera tliera ltiera iltera litera retali ertali rteali treali etrali terali reatli eratli raetli aretli eartli aertli rtaeli traeli rateli arteli tareli atreli etarli tearli eatrli aetrli taerli aterli retlai ertlai rtelai trelai etrlai terlai reltai erltai rletai lretai elrtai lertai rtleai trleai rlteai lrteai tlreai ltreai etlrai telrai eltrai letrai tlerai lterai realti eralti raelti arelti earlti aerlti relati erlati rleati lreati elrati lerati raleti arleti rlaeti lraeti alreti lareti ealrti aelrti elarti learti alerti laerti rtalei tralei ratlei artlei tarlei atrlei rtlaei trlaei rltaei lrtaei tlraei ltraei raltei arltei rlatei lratei alrtei lartei talrei atlrei tlarei ltarei altrei latrei etalri tealri eatlri aetlri taelri atelri etlari telari eltari letari tleari lteari ealtri aeltri elatri leatri aletri laetri taleri atleri tlaeri ltaeri alteri lateri reialt erialt riealt irealt eiralt ieralt reailt erailt raeilt areilt earilt aerilt riaelt iraelt raielt arielt iarelt airelt eiarlt iearlt eairlt aeirlt iaerlt aierlt reilat erilat rielat irelat eirlat ierlat reliat erliat rleiat lreiat elriat leriat rileat irleat rlieat lrieat ilreat lireat eilrat ielrat elirat leirat ilerat lierat realit eralit raelit arelit earlit aerlit relait erlait rleait lreait elrait lerait raleit arleit rlaeit lraeit alreit lareit ealrit aelrit elarit learit alerit laerit rialet iralet railet arilet iarlet airlet rilaet irlaet rliaet lriaet ilraet liraet raliet arliet rlaiet lraiet alriet lariet ialret ailret ilaret liaret aliret lairet eialrt iealrt eailrt aeilrt iaelrt aielrt eilart ielart eliart leiart ileart lieart ealirt aelirt elairt leairt aleirt laeirt ialert ailert ilaert liaert aliert laiert rtiale triale ritale irtale tirale itrale rtaile traile ratile artile tarile atrile riatle iratle raitle aritle iartle airtle tiarle itarle tairle atirle iatrle aitrle rtilae trilae ritlae irtlae tirlae itrlae rtliae trliae rltiae lrtiae tlriae ltriae riltae irltae rlitae lritae ilrtae lirtae tilrae itlrae tlirae ltirae iltrae litrae rtalie tralie ratlie artlie tarlie atrlie rtlaie trlaie rltaie lrtaie tlraie ltraie raltie arltie rlatie lratie alrtie lartie talrie atlrie tlarie ltarie altrie latrie rialte iralte railte arilte iarlte airlte rilate irlate rliate lriate ilrate lirate ralite arlite rlaite lraite alrite larite ialrte ailrte ilarte liarte alirte lairte tialre italre tailre atilre iatlre aitlre tilare itlare tliare ltiare iltare litare talire atlire tlaire ltaire altire latire ialtre ailtre ilatre liatre alitre laitre etialr teialr eitalr ietalr tiealr itealr etailr teailr eatilr aetilr taeilr ateilr eiatlr ieatlr eaitlr aeitlr iaetlr aietlr tiaelr itaelr taielr atielr iatelr aitelr etilar teilar eitlar ietlar tielar itelar etliar teliar eltiar letiar tleiar lteiar eiltar ieltar elitar leitar iletar lietar tilear itlear tliear ltiear iltear litear etalir tealir eatlir aetlir taelir atelir etlair telair eltair letair tleair lteair ealtir aeltir elatir leatir aletir laetir taleir atleir tlaeir ltaeir alteir lateir eialtr iealtr eailtr aeiltr iaeltr aieltr eilatr ielatr eliatr leiatr ileatr lieatr ealitr aelitr elaitr leaitr aleitr laeitr ialetr ailetr ilaetr liaetr alietr laietr tialer italer tailer atiler iatler aitler tilaer itlaer tliaer ltiaer iltaer litaer talier atlier tlaier ltaier altier latier ialter ailter ilater liater aliter laiter
Note: these 'words' (valid or invalid) are all the permutations of the word retial. These words are obtained by scrambling the letters in retial.