casern acsern csaern scaern ascern sacern caesrn acesrn ceasrn ecasrn aecsrn eacsrn csearn scearn cesarn ecsarn secarn escarn asecrn saecrn aescrn eascrn seacrn esacrn casren acsren csaren scaren ascren sacren carsen acrsen crasen rcasen arcsen racsen csraen scraen crsaen rcsaen srcaen rscaen asrcen sarcen arscen rascen sracen rsacen caersn acersn cearsn ecarsn aecrsn eacrsn caresn acresn craesn rcaesn arcesn racesn cerasn ecrasn creasn rceasn ercasn recasn aercsn earcsn arecsn raecsn eracsn reacsn cseran sceran cesran ecsran secran escran csrean screan crsean rcsean srcean rscean cersan ecrsan cresan rcesan ercsan recsan sercan esrcan srecan rsecan erscan rescan asercn saercn aesrcn easrcn searcn esarcn asrecn sarecn arsecn rasecn sraecn rsaecn aerscn earscn arescn raescn erascn reascn seracn esracn sreacn rseacn ersacn resacn casenr acsenr csaenr scaenr ascenr sacenr caesnr acesnr ceasnr ecasnr aecsnr eacsnr cseanr sceanr cesanr ecsanr secanr escanr asecnr saecnr aescnr eascnr seacnr esacnr casner acsner csaner scaner ascner sacner canser acnser cnaser ncaser ancser nacser csnaer scnaer cnsaer ncsaer sncaer nscaer asncer sancer anscer nascer snacer nsacer caensr acensr ceansr ecansr aecnsr eacnsr canesr acnesr cnaesr ncaesr ancesr nacesr cenasr ecnasr cneasr nceasr encasr necasr aencsr eancsr anecsr naecsr enacsr neacsr csenar scenar cesnar ecsnar secnar escnar csnear scnear cnsear ncsear sncear nscear censar ecnsar cnesar ncesar encsar necsar sencar esncar snecar nsecar enscar nescar asencr saencr aesncr easncr seancr esancr asnecr sanecr ansecr nasecr snaecr nsaecr aenscr eanscr anescr naescr enascr neascr senacr esnacr sneacr nseacr ensacr nesacr casrne acsrne csarne scarne ascrne sacrne carsne acrsne crasne rcasne arcsne racsne csrane scrane crsane rcsane srcane rscane asrcne sarcne arscne rascne sracne rsacne casnre acsnre csanre scanre ascnre sacnre cansre acnsre cnasre ncasre ancsre nacsre csnare scnare cnsare ncsare sncare nscare asncre sancre anscre nascre snacre nsacre carnse acrnse cranse rcanse arcnse racnse canrse acnrse cnarse ncarse ancrse nacrse crnase rcnase cnrase ncrase rncase nrcase arncse rancse anrcse narcse rnacse nracse csrnae scrnae crsnae rcsnae srcnae rscnae csnrae scnrae cnsrae ncsrae sncrae nscrae crnsae rcnsae cnrsae ncrsae rncsae nrcsae srncae rsncae snrcae nsrcae rnscae nrscae asrnce sarnce arsnce rasnce srance rsance asnrce sanrce ansrce nasrce snarce nsarce arnsce ransce anrsce narsce rnasce nrasce srnace rsnace snrace nsrace rnsace nrsace caerns acerns cearns ecarns aecrns eacrns carens acrens craens rcaens arcens racens cerans ecrans creans rceans ercans recans aercns earcns arecns raecns eracns reacns caenrs acenrs ceanrs ecanrs aecnrs eacnrs caners acners cnaers ncaers ancers nacers cenars ecnars cnears ncears encars necars aencrs eancrs anecrs naecrs enacrs neacrs carnes acrnes cranes rcanes arcnes racnes canres acnres cnares ncares ancres nacres crnaes rcnaes cnraes ncraes rncaes nrcaes arnces rances anrces narces rnaces nraces cernas ecrnas crenas rcenas ercnas recnas cenras ecnras cneras nceras encras necras crneas rcneas cnreas ncreas rnceas nrceas erncas rencas enrcas nercas rnecas nrecas aerncs earncs arencs raencs erancs reancs aenrcs eanrcs anercs naercs enarcs nearcs arnecs ranecs anrecs narecs rnaecs nraecs ernacs renacs enracs neracs rneacs nreacs cserna scerna cesrna ecsrna secrna escrna csrena screna crsena rcsena srcena rscena cersna ecrsna cresna rcesna ercsna recsna sercna esrcna srecna rsecna erscna rescna csenra scenra cesnra ecsnra secnra escnra csnera scnera cnsera ncsera sncera nscera censra ecnsra cnesra ncesra encsra necsra sencra esncra snecra nsecra enscra nescra csrnea scrnea crsnea rcsnea srcnea rscnea csnrea scnrea cnsrea ncsrea sncrea nscrea crnsea rcnsea cnrsea ncrsea rncsea nrcsea srncea rsncea snrcea nsrcea rnscea nrscea cernsa ecrnsa crensa rcensa ercnsa recnsa cenrsa ecnrsa cnersa ncersa encrsa necrsa crnesa rcnesa cnresa ncresa rncesa nrcesa erncsa rencsa enrcsa nercsa rnecsa nrecsa sernca esrnca srenca rsenca ersnca resnca senrca esnrca snerca nserca ensrca nesrca srneca rsneca snreca nsreca rnseca nrseca ernsca rensca enrsca nersca rnesca nresca asernc saernc aesrnc easrnc searnc esarnc asrenc sarenc arsenc rasenc sraenc rsaenc aersnc earsnc aresnc raesnc erasnc reasnc seranc esranc sreanc rseanc ersanc resanc asenrc saenrc aesnrc easnrc seanrc esanrc asnerc sanerc anserc naserc snaerc nsaerc aensrc eansrc anesrc naesrc enasrc neasrc senarc esnarc snearc nsearc ensarc nesarc asrnec sarnec arsnec rasnec sranec rsanec asnrec sanrec ansrec nasrec snarec nsarec arnsec ransec anrsec narsec rnasec nrasec srnaec rsnaec snraec nsraec rnsaec nrsaec aernsc earnsc arensc raensc eransc reansc aenrsc eanrsc anersc naersc enarsc nearsc arnesc ranesc anresc naresc rnaesc nraesc ernasc renasc enrasc nerasc rneasc nreasc sernac esrnac srenac rsenac ersnac resnac senrac esnrac snerac nserac ensrac nesrac srneac rsneac snreac nsreac rnseac nrseac ernsac rensac enrsac nersac rnesac nresac
Note: these 'words' (valid or invalid) are all the permutations of the word casern. These words are obtained by scrambling the letters in casern.