serial esrial sreial rseial ersial resial seiral esiral sieral iseral eisral iesral srieal rsieal sireal isreal riseal irseal erisal reisal eirsal iersal riesal iresal serail esrail sreail rseail ersail resail searil esaril saeril aseril easril aesril sraeil rsaeil sareil asreil raseil arseil erasil reasil earsil aersil raesil aresil seiarl esiarl siearl isearl eisarl iesarl seairl esairl saeirl aseirl easirl aesirl siaerl isaerl saierl asierl iaserl aiserl eiasrl ieasrl eaisrl aeisrl iaesrl aiesrl sriael rsiael sirael israel risael irsael sraiel rsaiel sariel asriel rasiel arsiel siarel isarel sairel asirel iasrel aisrel riasel irasel raisel arisel iarsel airsel eriasl reiasl eirasl ierasl rieasl ireasl eraisl reaisl earisl aerisl raeisl areisl eiarsl iearsl eairsl aeirsl iaersl aiersl riaesl iraesl raiesl ariesl iaresl airesl serila esrila sreila rseila ersila resila seirla esirla sierla iserla eisrla iesrla sriela rsiela sirela isrela risela irsela erisla reisla eirsla iersla riesla iresla serlia esrlia srelia rselia erslia reslia selria eslria sleria lseria elsria lesria srleia rsleia slreia lsreia rlseia lrseia erlsia relsia elrsia lersia rlesia lresia seilra esilra sielra iselra eislra ieslra selira eslira sleira lseira elsira lesira silera islera sliera lsiera ilsera lisera eilsra ielsra elisra leisra ilesra liesra srilea rsilea sirlea isrlea rislea irslea srliea rsliea slriea lsriea rlsiea lrsiea silrea islrea slirea lsirea ilsrea lisrea rilsea irlsea rlisea lrisea ilrsea lirsea erilsa reilsa eirlsa ierlsa rielsa irelsa erlisa relisa elrisa lerisa rleisa lreisa eilrsa ielrsa elirsa leirsa ilersa liersa rilesa irlesa rliesa lriesa ilresa liresa serali esrali sreali rseali ersali resali searli esarli saerli aserli easrli aesrli sraeli rsaeli sareli asreli raseli arseli erasli reasli earsli aersli raesli aresli serlai esrlai srelai rselai erslai reslai selrai eslrai slerai lserai elsrai lesrai srleai rsleai slreai lsreai rlseai lrseai erlsai relsai elrsai lersai rlesai lresai sealri esalri saelri aselri easlri aeslri selari eslari sleari lseari elsari lesari saleri asleri slaeri lsaeri alseri laseri ealsri aelsri elasri leasri alesri laesri sralei rsalei sarlei asrlei raslei arslei srlaei rslaei slraei lsraei rlsaei lrsaei salrei aslrei slarei lsarei alsrei lasrei ralsei arlsei rlasei lrasei alrsei larsei eralsi realsi earlsi aerlsi raelsi arelsi erlasi relasi elrasi lerasi rleasi lreasi ealrsi aelrsi elarsi learsi alersi laersi ralesi arlesi rlaesi lraesi alresi laresi seialr esialr siealr isealr eisalr iesalr seailr esailr saeilr aseilr easilr aesilr siaelr isaelr saielr asielr iaselr aiselr eiaslr ieaslr eaislr aeislr iaeslr aieslr seilar esilar sielar iselar eislar ieslar seliar esliar sleiar lseiar elsiar lesiar silear islear sliear lsiear ilsear lisear eilsar ielsar elisar leisar ilesar liesar sealir esalir saelir aselir easlir aeslir selair eslair sleair lseair elsair lesair saleir asleir slaeir lsaeir alseir laseir ealsir aelsir elasir leasir alesir laesir sialer isaler sailer asiler iasler aisler silaer islaer sliaer lsiaer ilsaer lisaer salier aslier slaier lsaier alsier lasier ialser ailser ilaser liaser aliser laiser eialsr iealsr eailsr aeilsr iaelsr aielsr eilasr ielasr eliasr leiasr ileasr lieasr ealisr aelisr elaisr leaisr aleisr laeisr ialesr ailesr ilaesr liaesr aliesr laiesr sriale rsiale sirale israle risale irsale sraile rsaile sarile asrile rasile arsile siarle isarle sairle asirle iasrle aisrle riasle irasle raisle arisle iarsle airsle srilae rsilae sirlae isrlae rislae irslae srliae rsliae slriae lsriae rlsiae lrsiae silrae islrae slirae lsirae ilsrae lisrae rilsae irlsae rlisae lrisae ilrsae lirsae sralie rsalie sarlie asrlie raslie arslie srlaie rslaie slraie lsraie rlsaie lrsaie salrie aslrie slarie lsarie alsrie lasrie ralsie arlsie rlasie lrasie alrsie larsie sialre isalre sailre asilre iaslre aislre silare islare sliare lsiare ilsare lisare salire aslire slaire lsaire alsire lasire ialsre ailsre ilasre liasre alisre laisre rialse iralse railse arilse iarlse airlse rilase irlase rliase lriase ilrase lirase ralise arlise rlaise lraise alrise larise ialrse ailrse ilarse liarse alirse lairse erials reials eirals ierals rieals ireals erails reails earils aerils raeils areils eiarls iearls eairls aeirls iaerls aierls riaels iraels raiels ariels iarels airels erilas reilas eirlas ierlas rielas irelas erlias relias elrias lerias rleias lreias eilras ielras eliras leiras ileras lieras rileas irleas rlieas lrieas ilreas lireas eralis realis earlis aerlis raelis arelis erlais relais elrais lerais rleais lreais ealris aelris elaris learis aleris laeris raleis arleis rlaeis lraeis alreis lareis eialrs iealrs eailrs aeilrs iaelrs aielrs eilars ielars eliars leiars ilears liears ealirs aelirs elairs leairs aleirs laeirs ialers ailers ilaers liaers aliers laiers riales irales railes ariles iarles airles rilaes irlaes rliaes lriaes ilraes liraes ralies arlies rlaies lraies alries laries ialres ailres ilares liares alires laires
Note: these 'words' (valid or invalid) are all the permutations of the word serial. These words are obtained by scrambling the letters in serial.