reasts erasts raests arests earsts aersts resats ersats rseats sreats esrats serats rasets arsets rsaets sraets asrets sarets easrts aesrts esarts searts aserts saerts reatss eratss raetss aretss eartss aertss retass ertass rteass treass etrass terass ratess artess rtaess traess atress taress eatrss aetrss etarss tearss aterss taerss restas erstas rsetas sretas esrtas sertas retsas ertsas rtesas tresas etrsas tersas rsteas srteas rtseas trseas streas tsreas estras setras etsras tesras steras tseras rastes arstes rsates srates asrtes sartes ratses artses rtases trases atrses tarses rstaes srtaes rtsaes trsaes straes tsraes astres satres atsres tasres stares tsares eastrs aestrs esatrs seatrs asetrs saetrs eatsrs aetsrs etasrs teasrs atesrs taesrs estars setars etsars tesars stears tsears asters saters atsers tasers staers tsaers reasst erasst raesst aresst earsst aersst resast ersast rseast sreast esrast serast rasest arsest rsaest sraest asrest sarest easrst aesrst esarst searst aserst saerst reasst erasst raesst aresst earsst aersst resast ersast rseast sreast esrast serast rasest arsest rsaest sraest asrest sarest easrst aesrst esarst searst aserst saerst ressat erssat rsesat sresat esrsat sersat ressat erssat rsesat sresat esrsat sersat rsseat srseat rsseat srseat ssreat ssreat essrat sesrat essrat sesrat sserat sserat rasset arsset rsaset sraset asrset sarset rasset arsset rsaset sraset asrset sarset rssaet srsaet rssaet srsaet ssraet ssraet assret sasret assret sasret ssaret ssaret eassrt aessrt esasrt seasrt asesrt saesrt eassrt aessrt esasrt seasrt asesrt saesrt essart sesart essart sesart sseart sseart assert sasert assert sasert ssaert ssaert reatss eratss raetss aretss eartss aertss retass ertass rteass treass etrass terass ratess artess rtaess traess atress taress eatrss aetrss etarss tearss aterss taerss reasts erasts raests arests earsts aersts resats ersats rseats sreats esrats serats rasets arsets rsaets sraets asrets sarets easrts aesrts esarts searts aserts saerts retsas ertsas rtesas tresas etrsas tersas restas erstas rsetas sretas esrtas sertas rtseas trseas rsteas srteas tsreas streas etsras tesras estras setras tseras steras ratses artses rtases trases atrses tarses rastes arstes rsates srates asrtes sartes rtsaes trsaes rstaes srtaes tsraes straes atsres tasres astres satres tsares stares eatsrs aetsrs etasrs teasrs atesrs taesrs eastrs aestrs esatrs seatrs asetrs saetrs etsars tesars estars setars tsears stears atsers tasers asters saters tsaers staers restsa erstsa rsetsa sretsa esrtsa sertsa retssa ertssa rtessa tressa etrssa terssa rstesa srtesa rtsesa trsesa stresa tsresa estrsa setrsa etsrsa tesrsa stersa tsersa ressta erssta rsesta sresta esrsta sersta ressta erssta rsesta sresta esrsta sersta rsseta srseta rsseta srseta ssreta ssreta essrta sesrta essrta sesrta sserta sserta retssa ertssa rtessa tressa etrssa terssa restsa erstsa rsetsa sretsa esrtsa sertsa rtsesa trsesa rstesa srtesa tsresa stresa etsrsa tesrsa estrsa setrsa tsersa stersa rstsea srtsea rtssea trssea strsea tsrsea rsstea srstea rsstea srstea ssrtea ssrtea rtssea trssea rstsea srtsea tsrsea strsea stsrea tssrea sstrea sstrea tssrea stsrea estsra setsra etssra tessra stesra tsesra esstra sestra esstra sestra ssetra ssetra etssra tessra estsra setsra tsesra stesra stsera tssera sstera sstera tssera stsera rastse arstse rsatse sratse asrtse sartse ratsse artsse rtasse trasse atrsse tarsse rstase srtase rtsase trsase strase tsrase astrse satrse atsrse tasrse starse tsarse rasste arsste rsaste sraste asrste sarste rasste arsste rsaste sraste asrste sarste rssate srsate rssate srsate ssrate ssrate assrte sasrte assrte sasrte ssarte ssarte ratsse artsse rtasse trasse atrsse tarsse rastse arstse rsatse sratse asrtse sartse rtsase trsase rstase srtase tsrase strase atsrse tasrse astrse satrse tsarse starse rstsae srtsae rtssae trssae strsae tsrsae rsstae srstae rsstae srstae ssrtae ssrtae rtssae trssae rstsae srtsae tsrsae strsae stsrae tssrae sstrae sstrae tssrae stsrae astsre satsre atssre tassre stasre tsasre asstre sastre asstre sastre ssatre ssatre atssre tassre astsre satsre tsasre stasre stsare tssare sstare sstare tssare stsare eastsr aestsr esatsr seatsr asetsr saetsr eatssr aetssr etassr teassr atessr taessr estasr setasr etsasr tesasr steasr tseasr astesr satesr atsesr tasesr staesr tsaesr easstr aesstr esastr seastr asestr saestr easstr aesstr esastr seastr asestr saestr essatr sesatr essatr sesatr sseatr sseatr assetr sasetr assetr sasetr ssaetr ssaetr eatssr aetssr etassr teassr atessr taessr eastsr aestsr esatsr seatsr asetsr saetsr etsasr tesasr estasr setasr tseasr steasr atsesr tasesr astesr satesr tsaesr staesr estsar setsar etssar tessar stesar tsesar esstar sestar esstar sestar ssetar ssetar etssar tessar estsar setsar tsesar stesar stsear tssear sstear sstear tssear stsear astser satser atsser tasser staser tsaser asster saster asster saster ssater ssater atsser tasser astser satser tsaser staser stsaer tssaer sstaer sstaer tssaer stsaer
Note: these 'words' (valid or invalid) are all the permutations of the word reasts. These words are obtained by scrambling the letters in reasts.