sperst pserst seprst esprst pesrst epsrst sprest psrest srpest rspest prsest rpsest serpst esrpst srepst rsepst erspst respst persst eprsst presst rpesst erpsst repsst spesrt psesrt sepsrt espsrt pessrt epssrt spsert pssert sspert sspert pssert spsert sesprt essprt sseprt sseprt essprt sesprt pessrt epssrt psesrt spesrt espsrt sepsrt sprset psrset srpset rspset prsset rpsset spsret pssret sspret sspret pssret spsret srspet rsspet ssrpet ssrpet rsspet srspet prsset rpsset psrset sprset rspset srpset serspt esrspt srespt rsespt ersspt resspt sesrpt essrpt sserpt sserpt essrpt sesrpt srsept rssept ssrept ssrept rssept srsept ersspt resspt esrspt serspt rsespt srespt persst eprsst presst rpesst erpsst repsst pesrst epsrst pserst sperst esprst seprst prsest rpsest psrest sprest rspest srpest erspst respst esrpst serpst rsepst srepst sperts pserts seprts esprts pesrts epsrts sprets psrets srpets rspets prsets rpsets serpts esrpts srepts rsepts erspts respts persts eprsts prests rpests erpsts repsts spetrs psetrs septrs esptrs pestrs epstrs spters psters stpers tspers ptsers tpsers setprs estprs steprs tseprs etsprs tesprs petsrs eptsrs ptesrs tpesrs etpsrs tepsrs sprtes psrtes srptes rsptes prstes rpstes sptres pstres stpres tspres ptsres tpsres srtpes rstpes strpes tsrpes rtspes trspes prtses rptses ptrses tprses rtpses trpses sertps esrtps sretps rsetps erstps restps setrps estrps sterps tserps etsrps tesrps srteps rsteps streps tsreps rtseps trseps ertsps retsps etrsps tersps rtesps tresps pertss eprtss pretss rpetss erptss reptss petrss eptrss pterss tperss etprss teprss prtess rptess ptress tpress rtpess trpess ertpss retpss etrpss terpss rtepss trepss spestr psestr sepstr espstr pesstr epsstr spsetr pssetr sspetr sspetr pssetr spsetr sesptr essptr sseptr sseptr essptr sesptr pesstr epsstr psestr spestr espstr sepstr spetsr psetsr septsr esptsr pestsr epstsr sptesr pstesr stpesr tspesr ptsesr tpsesr setpsr estpsr stepsr tsepsr etspsr tespsr petssr eptssr ptessr tpessr etpssr tepssr spster psster sspter sspter psster spster sptser pstser stpser tspser ptsser tpsser sstper sstper stsper tssper stsper tssper pstser sptser ptsser tpsser stpser tspser sestpr esstpr ssetpr ssetpr esstpr sestpr setspr estspr stespr tsespr etsspr tesspr sstepr sstepr stsepr tssepr stsepr tssepr estspr setspr etsspr tesspr stespr tsespr pestsr epstsr psetsr spetsr esptsr septsr petssr eptssr ptessr tpessr etpssr tepssr pstesr sptesr ptsesr tpsesr stpesr tspesr estpsr setpsr etspsr tespsr stepsr tsepsr sprste psrste srpste rspste prsste rpsste spsrte pssrte ssprte ssprte pssrte spsrte srspte rsspte ssrpte ssrpte rsspte srspte prsste rpsste psrste sprste rspste srpste sprtse psrtse srptse rsptse prstse rpstse sptrse pstrse stprse tsprse ptsrse tpsrse srtpse rstpse strpse tsrpse rtspse trspse prtsse rptsse ptrsse tprsse rtpsse trpsse spstre psstre ssptre ssptre psstre spstre sptsre pstsre stpsre tspsre ptssre tpssre sstpre sstpre stspre tsspre stspre tsspre pstsre sptsre ptssre tpssre stpsre tspsre srstpe rsstpe ssrtpe ssrtpe rsstpe srstpe srtspe rstspe strspe tsrspe rtsspe trsspe sstrpe sstrpe stsrpe tssrpe stsrpe tssrpe rstspe srtspe rtsspe trsspe strspe tsrspe prstse rpstse psrtse sprtse rsptse srptse prtsse rptsse ptrsse tprsse rtpsse trpsse pstrse sptrse ptsrse tpsrse stprse tsprse rstpse srtpse rtspse trspse strpse tsrpse serstp esrstp srestp rsestp ersstp resstp sesrtp essrtp ssertp ssertp essrtp sesrtp srsetp rssetp ssretp ssretp rssetp srsetp ersstp resstp esrstp serstp rsestp srestp sertsp esrtsp sretsp rsetsp erstsp restsp setrsp estrsp stersp tsersp etsrsp tesrsp srtesp rstesp stresp tsresp rtsesp trsesp ertssp retssp etrssp terssp rtessp tressp sestrp esstrp ssetrp ssetrp esstrp sestrp setsrp estsrp stesrp tsesrp etssrp tessrp ssterp ssterp stserp tsserp stserp tsserp estsrp setsrp etssrp tessrp stesrp tsesrp srstep rsstep ssrtep ssrtep rsstep srstep srtsep rstsep strsep tsrsep rtssep trssep sstrep sstrep stsrep tssrep stsrep tssrep rstsep srtsep rtssep trssep strsep tsrsep erstsp restsp esrtsp sertsp rsetsp sretsp ertssp retssp etrssp terssp rtessp tressp estrsp setrsp etsrsp tesrsp stersp tsersp rstesp srtesp rtsesp trsesp stresp tsresp persts eprsts prests rpests erpsts repsts pesrts epsrts pserts sperts esprts seprts prsets rpsets psrets sprets rspets srpets erspts respts esrpts serpts rsepts srepts pertss eprtss pretss rpetss erptss reptss petrss eptrss pterss tperss etprss teprss prtess rptess ptress tpress rtpess trpess ertpss retpss etrpss terpss rtepss trepss pestrs epstrs psetrs spetrs esptrs septrs petsrs eptsrs ptesrs tpesrs etpsrs tepsrs psters spters ptsers tpsers stpers tspers estprs setprs etsprs tesprs steprs tseprs prstes rpstes psrtes sprtes rsptes srptes prtses rptses ptrses tprses rtpses trpses pstres sptres ptsres tpsres stpres tspres rstpes srtpes rtspes trspes strpes tsrpes erstps restps esrtps sertps rsetps sretps ertsps retsps etrsps tersps rtesps tresps estrps setrps etsrps tesrps sterps tserps rsteps srteps rtseps trseps streps tsreps
Note: these 'words' (valid or invalid) are all the permutations of the word sperst. These words are obtained by scrambling the letters in sperst.