trails rtails tarils atrils ratils artils trials rtials tirals itrals ritals irtals tairls atirls tiarls itarls aitrls iatrls raitls aritls riatls iratls airtls iartls tralis rtalis tarlis atrlis ratlis artlis trlais rtlais tlrais ltrais rltais lrtais talris atlris tlaris ltaris altris latris raltis arltis rlatis lratis alrtis lartis trilas rtilas tirlas itrlas ritlas irtlas trlias rtlias tlrias ltrias rltias lrtias tilras itlras tliras ltiras iltras litras riltas irltas rlitas lritas ilrtas lirtas tailrs atilrs tialrs italrs aitlrs iatlrs talirs atlirs tlairs ltairs altirs latirs tilars itlars tliars ltiars iltars litars ailtrs ialtrs alitrs laitrs ilatrs liatrs railts arilts rialts iralts airlts iarlts ralits arlits rlaits lraits alrits larits rilats irlats rliats lriats ilrats lirats ailrts ialrts alirts lairts ilarts liarts traisl rtaisl tarisl atrisl ratisl artisl triasl rtiasl tirasl itrasl ritasl irtasl tairsl atirsl tiarsl itarsl aitrsl iatrsl raitsl aritsl riatsl iratsl airtsl iartsl trasil rtasil tarsil atrsil ratsil artsil trsail rtsail tsrail strail rstail srtail tasril atsril tsaril staril astril satril rastil arstil rsatil sratil asrtil sartil trisal rtisal tirsal itrsal ritsal irtsal trsial rtsial tsrial strial rstial srtial tisral itsral tsiral stiral istral sitral ristal irstal rsital srital isrtal sirtal taisrl atisrl tiasrl itasrl aitsrl iatsrl tasirl atsirl tsairl stairl astirl satirl tisarl itsarl tsiarl stiarl istarl sitarl aistrl iastrl asitrl saitrl isatrl siatrl raistl aristl riastl irastl airstl iarstl rasitl arsitl rsaitl sraitl asritl saritl risatl irsatl rsiatl sriatl isratl siratl aisrtl iasrtl asirtl sairtl isartl siartl tralsi rtalsi tarlsi atrlsi ratlsi artlsi trlasi rtlasi tlrasi ltrasi rltasi lrtasi talrsi atlrsi tlarsi ltarsi altrsi latrsi raltsi arltsi rlatsi lratsi alrtsi lartsi trasli rtasli tarsli atrsli ratsli artsli trsali rtsali tsrali strali rstali srtali tasrli atsrli tsarli starli astrli satrli rastli arstli rsatli sratli asrtli sartli trlsai rtlsai tlrsai ltrsai rltsai lrtsai trslai rtslai tsrlai strlai rstlai srtlai tlsrai ltsrai tslrai stlrai lstrai sltrai rlstai lrstai rsltai srltai lsrtai slrtai talsri atlsri tlasri ltasri altsri latsri taslri atslri tsalri stalri astlri satlri tlsari ltsari tslari stlari lstari sltari alstri lastri asltri saltri lsatri slatri ralsti arlsti rlasti lrasti alrsti larsti raslti arslti rsalti sralti asrlti sarlti rlsati lrsati rslati srlati lsrati slrati alsrti lasrti aslrti salrti lsarti slarti trilsa rtilsa tirlsa itrlsa ritlsa irtlsa trlisa rtlisa tlrisa ltrisa rltisa lrtisa tilrsa itlrsa tlirsa ltirsa iltrsa litrsa riltsa irltsa rlitsa lritsa ilrtsa lirtsa trisla rtisla tirsla itrsla ritsla irtsla trsila rtsila tsrila strila rstila srtila tisrla itsrla tsirla stirla istrla sitrla ristla irstla rsitla sritla isrtla sirtla trlsia rtlsia tlrsia ltrsia rltsia lrtsia trslia rtslia tsrlia strlia rstlia srtlia tlsria ltsria tslria stlria lstria sltria rlstia lrstia rsltia srltia lsrtia slrtia tilsra itlsra tlisra ltisra iltsra litsra tislra itslra tsilra stilra istlra sitlra tlsira ltsira tslira stlira lstira sltira ilstra listra isltra siltra lsitra slitra rilsta irlsta rlista lrista ilrsta lirsta rislta irslta rsilta srilta isrlta sirlta rlsita lrsita rslita srlita lsrita slrita ilsrta lisrta islrta silrta lsirta slirta tailsr atilsr tialsr italsr aitlsr iatlsr talisr atlisr tlaisr ltaisr altisr latisr tilasr itlasr tliasr ltiasr iltasr litasr ailtsr ialtsr alitsr laitsr ilatsr liatsr taislr atislr tiaslr itaslr aitslr iatslr tasilr atsilr tsailr stailr astilr satilr tisalr itsalr tsialr stialr istalr sitalr aistlr iastlr asitlr saitlr isatlr siatlr talsir atlsir tlasir ltasir altsir latsir taslir atslir tsalir stalir astlir satlir tlsair ltsair tslair stlair lstair sltair alstir lastir asltir saltir lsatir slatir tilsar itlsar tlisar ltisar iltsar litsar tislar itslar tsilar stilar istlar sitlar tlsiar ltsiar tsliar stliar lstiar sltiar ilstar listar isltar siltar lsitar slitar ailstr ialstr alistr laistr ilastr liastr aisltr iasltr asiltr sailtr isaltr sialtr alsitr lasitr aslitr salitr lsaitr slaitr ilsatr lisatr islatr silatr lsiatr sliatr railst arilst rialst iralst airlst iarlst ralist arlist rlaist lraist alrist larist rilast irlast rliast lriast ilrast lirast ailrst ialrst alirst lairst ilarst liarst raislt arislt riaslt iraslt airslt iarslt rasilt arsilt rsailt srailt asrilt sarilt risalt irsalt rsialt srialt isralt siralt aisrlt iasrlt asirlt sairlt isarlt siarlt ralsit arlsit rlasit lrasit alrsit larsit raslit arslit rsalit sralit asrlit sarlit rlsait lrsait rslait srlait lsrait slrait alsrit lasrit aslrit salrit lsarit slarit rilsat irlsat rlisat lrisat ilrsat lirsat rislat irslat rsilat srilat isrlat sirlat rlsiat lrsiat rsliat srliat lsriat slriat ilsrat lisrat islrat silrat lsirat slirat ailsrt ialsrt alisrt laisrt ilasrt liasrt aislrt iaslrt asilrt sailrt isalrt sialrt alsirt lasirt aslirt salirt lsairt slairt ilsart lisart islart silart lsiart sliart
Note: these 'words' (valid or invalid) are all the permutations of the word trails. These words are obtained by scrambling the letters in trails.