recurs ercurs rceurs creurs ecrurs cerurs reucrs erucrs ruecrs urecrs eurcrs uercrs rcuers cruers rucers urcers curers ucrers ecurrs ceurrs eucrrs uecrrs cuerrs ucerrs recrus ercrus rcerus crerus ecrrus cerrus rercus errcus rrecus rrecus errcus rercus rcreus crreus rrceus rrceus crreus rcreus ecrrus cerrus ercrus recrus crerus rcerus reurcs erurcs ruercs urercs eurrcs uerrcs rerucs errucs rreucs rreucs errucs rerucs rurecs urrecs rruecs rruecs urrecs rurecs eurrcs uerrcs erurcs reurcs urercs ruercs rcures crures rucres urcres curres ucrres rcrues crrues rrcues rrcues crrues rcrues rurces urrces rruces rruces urrces rurces curres ucrres crures rcures urcres rucres ecurrs ceurrs eucrrs uecrrs cuerrs ucerrs ecrurs cerurs ercurs recurs creurs rceurs eurcrs uercrs erucrs reucrs urecrs ruecrs curers ucrers cruers rcuers urcers rucers recusr ercusr rceusr creusr ecrusr cerusr reucsr erucsr ruecsr urecsr eurcsr uercsr rcuesr cruesr rucesr urcesr curesr ucresr ecursr ceursr eucrsr uecrsr cuersr ucersr recsur ercsur rcesur cresur ecrsur cersur rescur erscur rsecur srecur esrcur sercur rcseur crseur rsceur srceur csreur screur ecsrur cesrur escrur secrur cserur scerur reuscr eruscr ruescr urescr eurscr uerscr resucr ersucr rseucr sreucr esrucr serucr rusecr ursecr rsuecr sruecr usrecr surecr eusrcr uesrcr esurcr seurcr usercr suercr rcuser cruser rucser urcser curser ucrser rcsuer crsuer rscuer srcuer csruer scruer ruscer urscer rsucer srucer usrcer surcer cusrer ucsrer csurer scurer uscrer sucrer ecusrr ceusrr eucsrr uecsrr cuesrr ucesrr ecsurr cesurr escurr securr cseurr sceurr euscrr uescrr esucrr seucrr usecrr suecrr cuserr ucserr csuerr scuerr uscerr sucerr recrsu ercrsu rcersu crersu ecrrsu cerrsu rercsu errcsu rrecsu rrecsu errcsu rercsu rcresu crresu rrcesu rrcesu crresu rcresu ecrrsu cerrsu ercrsu recrsu crersu rcersu recsru ercsru rcesru cresru ecrsru cersru rescru erscru rsecru srecru esrcru sercru rcseru crseru rsceru srceru csreru screru ecsrru cesrru escrru secrru cserru scerru rerscu errscu rrescu rrescu errscu rerscu resrcu ersrcu rsercu srercu esrrcu serrcu rrsecu rrsecu rsrecu srrecu rsrecu srrecu ersrcu resrcu esrrcu serrcu rsercu srercu rcrseu crrseu rrcseu rrcseu crrseu rcrseu rcsreu crsreu rscreu srcreu csrreu scrreu rrsceu rrsceu rsrceu srrceu rsrceu srrceu crsreu rcsreu csrreu scrreu rscreu srcreu ecrsru cersru ercsru recsru cresru rcesru ecsrru cesrru escrru secrru cserru scerru erscru rescru esrcru sercru rsecru srecru crseru rcseru csreru screru rsceru srceru reursc erursc ruersc urersc eurrsc uerrsc rerusc errusc rreusc rreusc errusc rerusc ruresc urresc rruesc rruesc urresc ruresc eurrsc uerrsc erursc reursc urersc ruersc reusrc erusrc ruesrc uresrc eursrc uersrc resurc ersurc rseurc sreurc esrurc serurc ruserc urserc rsuerc sruerc usrerc surerc eusrrc uesrrc esurrc seurrc userrc suerrc rersuc errsuc rresuc rresuc errsuc rersuc resruc ersruc rseruc sreruc esrruc serruc rrseuc rrseuc rsreuc srreuc rsreuc srreuc ersruc resruc esrruc serruc rseruc sreruc rursec urrsec rrusec rrusec urrsec rursec rusrec ursrec rsurec srurec usrrec surrec rrsuec rrsuec rsruec srruec rsruec srruec ursrec rusrec usrrec surrec rsurec srurec eursrc uersrc erusrc reusrc uresrc ruesrc eusrrc uesrrc esurrc seurrc userrc suerrc ersurc resurc esrurc serurc rseurc sreurc urserc ruserc usrerc surerc rsuerc sruerc rcurse crurse rucrse urcrse currse ucrrse rcruse crruse rrcuse rrcuse crruse rcruse rurcse urrcse rrucse rrucse urrcse rurcse currse ucrrse crurse rcurse urcrse rucrse rcusre crusre rucsre urcsre cursre ucrsre rcsure crsure rscure srcure csrure scrure ruscre urscre rsucre srucre usrcre surcre cusrre ucsrre csurre scurre uscrre sucrre rcrsue crrsue rrcsue rrcsue crrsue rcrsue rcsrue crsrue rscrue srcrue csrrue scrrue rrscue rrscue rsrcue srrcue rsrcue srrcue crsrue rcsrue csrrue scrrue rscrue srcrue rursce urrsce rrusce rrusce urrsce rursce rusrce ursrce rsurce srurce usrrce surrce rrsuce rrsuce rsruce srruce rsruce srruce ursrce rusrce usrrce surrce rsurce srurce cursre ucrsre crusre rcusre urcsre rucsre cusrre ucsrre csurre scurre uscrre sucrre crsure rcsure csrure scrure rscure srcure urscre ruscre usrcre surcre rsucre srucre ecursr ceursr eucrsr uecrsr cuersr ucersr ecrusr cerusr ercusr recusr creusr rceusr eurcsr uercsr erucsr reucsr urecsr ruecsr curesr ucresr cruesr rcuesr urcesr rucesr ecusrr ceusrr eucsrr uecsrr cuesrr ucesrr ecsurr cesurr escurr securr cseurr sceurr euscrr uescrr esucrr seucrr usecrr suecrr cuserr ucserr csuerr scuerr uscerr sucerr ecrsur cersur ercsur recsur cresur rcesur ecsrur cesrur escrur secrur cserur scerur erscur rescur esrcur sercur rsecur srecur crseur rcseur csreur screur rsceur srceur eurscr uerscr eruscr reuscr urescr ruescr eusrcr uesrcr esurcr seurcr usercr suercr ersucr resucr esrucr serucr rseucr sreucr ursecr rusecr usrecr surecr rsuecr sruecr curser ucrser cruser rcuser urcser rucser cusrer ucsrer csurer scurer uscrer sucrer crsuer rcsuer csruer scruer rscuer srcuer urscer ruscer usrcer surcer rsucer srucer
Note: these 'words' (valid or invalid) are all the permutations of the word recurs. These words are obtained by scrambling the letters in recurs.