preifs rpeifs perifs eprifs repifs erpifs priefs rpiefs pirefs iprefs ripefs irpefs peirfs epirfs pierfs iperfs eiprfs ieprfs reipfs eripfs riepfs irepfs eirpfs ierpfs prefis rpefis perfis eprfis repfis erpfis prfeis rpfeis pfreis fpreis rfpeis frpeis pefris epfris pferis fperis efpris fepris refpis erfpis rfepis frepis efrpis ferpis prifes rpifes pirfes iprfes ripfes irpfes prfies rpfies pfries fpries rfpies frpies pifres ipfres pfires fpires ifpres fipres rifpes irfpes rfipes fripes ifrpes firpes peifrs epifrs piefrs ipefrs eipfrs iepfrs pefirs epfirs pfeirs fpeirs efpirs fepirs pifers ipfers pfiers fpiers ifpers fipers eifprs iefprs efiprs feiprs ifeprs fieprs reifps erifps riefps irefps eirfps ierfps refips erfips rfeips freips efrips ferips rifeps irfeps rfieps frieps ifreps fireps eifrps iefrps efirps feirps iferps fierps preisf rpeisf perisf eprisf repisf erpisf priesf rpiesf piresf ipresf ripesf irpesf peirsf epirsf piersf ipersf eiprsf ieprsf reipsf eripsf riepsf irepsf eirpsf ierpsf presif rpesif persif eprsif repsif erpsif prseif rpseif psreif spreif rspeif srpeif pesrif epsrif pserif sperif esprif seprif respif erspif rsepif srepif esrpif serpif prisef rpisef pirsef iprsef ripsef irpsef prsief rpsief psrief sprief rspief srpief pisref ipsref psiref spiref ispref sipref rispef irspef rsipef sripef isrpef sirpef peisrf episrf piesrf ipesrf eipsrf iepsrf pesirf epsirf pseirf speirf espirf sepirf piserf ipserf psierf spierf isperf siperf eisprf iesprf esiprf seiprf iseprf sieprf reispf erispf riespf irespf eirspf ierspf resipf ersipf rseipf sreipf esripf seripf risepf irsepf rsiepf sriepf isrepf sirepf eisrpf iesrpf esirpf seirpf iserpf sierpf prefsi rpefsi perfsi eprfsi repfsi erpfsi prfesi rpfesi pfresi fpresi rfpesi frpesi pefrsi epfrsi pfersi fpersi efprsi feprsi refpsi erfpsi rfepsi frepsi efrpsi ferpsi presfi rpesfi persfi eprsfi repsfi erpsfi prsefi rpsefi psrefi sprefi rspefi srpefi pesrfi epsrfi pserfi sperfi esprfi seprfi respfi erspfi rsepfi srepfi esrpfi serpfi prfsei rpfsei pfrsei fprsei rfpsei frpsei prsfei rpsfei psrfei sprfei rspfei srpfei pfsrei fpsrei psfrei spfrei fsprei sfprei rfspei frspei rsfpei srfpei fsrpei sfrpei pefsri epfsri pfesri fpesri efpsri fepsri pesfri epsfri psefri spefri espfri sepfri pfseri fpseri psferi spferi fsperi sfperi efspri fespri esfpri sefpri fsepri sfepri refspi erfspi rfespi frespi efrspi ferspi resfpi ersfpi rsefpi srefpi esrfpi serfpi rfsepi frsepi rsfepi srfepi fsrepi sfrepi efsrpi fesrpi esfrpi sefrpi fserpi sferpi prifse rpifse pirfse iprfse ripfse irpfse prfise rpfise pfrise fprise rfpise frpise pifrse ipfrse pfirse fpirse ifprse fiprse rifpse irfpse rfipse fripse ifrpse firpse prisfe rpisfe pirsfe iprsfe ripsfe irpsfe prsife rpsife psrife sprife rspife srpife pisrfe ipsrfe psirfe spirfe isprfe siprfe rispfe irspfe rsipfe sripfe isrpfe sirpfe prfsie rpfsie pfrsie fprsie rfpsie frpsie prsfie rpsfie psrfie sprfie rspfie srpfie pfsrie fpsrie psfrie spfrie fsprie sfprie rfspie frspie rsfpie srfpie fsrpie sfrpie pifsre ipfsre pfisre fpisre ifpsre fipsre pisfre ipsfre psifre spifre ispfre sipfre pfsire fpsire psfire spfire fspire sfpire ifspre fispre isfpre sifpre fsipre sfipre rifspe irfspe rfispe frispe ifrspe firspe risfpe irsfpe rsifpe srifpe isrfpe sirfpe rfsipe frsipe rsfipe srfipe fsripe sfripe ifsrpe fisrpe isfrpe sifrpe fsirpe sfirpe peifsr epifsr piefsr ipefsr eipfsr iepfsr pefisr epfisr pfeisr fpeisr efpisr fepisr pifesr ipfesr pfiesr fpiesr ifpesr fipesr eifpsr iefpsr efipsr feipsr ifepsr fiepsr peisfr episfr piesfr ipesfr eipsfr iepsfr pesifr epsifr pseifr speifr espifr sepifr pisefr ipsefr psiefr spiefr ispefr sipefr eispfr iespfr esipfr seipfr isepfr siepfr pefsir epfsir pfesir fpesir efpsir fepsir pesfir epsfir psefir spefir espfir sepfir pfseir fpseir psfeir spfeir fspeir sfpeir efspir fespir esfpir sefpir fsepir sfepir pifser ipfser pfiser fpiser ifpser fipser pisfer ipsfer psifer spifer ispfer sipfer pfsier fpsier psfier spfier fspier sfpier ifsper fisper isfper sifper fsiper sfiper eifspr iefspr efispr feispr ifespr fiespr eisfpr iesfpr esifpr seifpr isefpr siefpr efsipr fesipr esfipr sefipr fseipr sfeipr ifsepr fisepr isfepr sifepr fsiepr sfiepr reifsp erifsp riefsp irefsp eirfsp ierfsp refisp erfisp rfeisp freisp efrisp ferisp rifesp irfesp rfiesp friesp ifresp firesp eifrsp iefrsp efirsp feirsp ifersp fiersp reisfp erisfp riesfp iresfp eirsfp iersfp resifp ersifp rseifp sreifp esrifp serifp risefp irsefp rsiefp sriefp isrefp sirefp eisrfp iesrfp esirfp seirfp iserfp sierfp refsip erfsip rfesip fresip efrsip fersip resfip ersfip rsefip srefip esrfip serfip rfseip frseip rsfeip srfeip fsreip sfreip efsrip fesrip esfrip sefrip fserip sferip rifsep irfsep rfisep frisep ifrsep firsep risfep irsfep rsifep srifep isrfep sirfep rfsiep frsiep rsfiep srfiep fsriep sfriep ifsrep fisrep isfrep sifrep fsirep sfirep eifsrp iefsrp efisrp feisrp ifesrp fiesrp eisfrp iesfrp esifrp seifrp isefrp siefrp efsirp fesirp esfirp sefirp fseirp sfeirp ifserp fiserp isferp siferp fsierp sfierp
Note: these 'words' (valid or invalid) are all the permutations of the word preifs. These words are obtained by scrambling the letters in preifs.