prents rpents pernts eprnts repnts erpnts prnets rpnets pnrets nprets rnpets nrpets penrts epnrts pnerts nperts enprts neprts renpts ernpts rnepts nrepts enrpts nerpts pretns rpetns pertns eprtns reptns erptns prtens rptens ptrens tprens rtpens trpens petrns eptrns pterns tperns etprns teprns retpns ertpns rtepns trepns etrpns terpns prntes rpntes pnrtes nprtes rnptes nrptes prtnes rptnes ptrnes tprnes rtpnes trpnes pntres nptres ptnres tpnres ntpres tnpres rntpes nrtpes rtnpes trnpes ntrpes tnrpes pentrs epntrs pnetrs npetrs enptrs neptrs petnrs eptnrs ptenrs tpenrs etpnrs tepnrs pnters npters ptners tpners ntpers tnpers entprs netprs etnprs tenprs nteprs tneprs rentps erntps rnetps nretps enrtps nertps retnps ertnps rtenps trenps etrnps ternps rnteps nrteps rtneps trneps ntreps tnreps entrps netrps etnrps tenrps nterps tnerps prenst rpenst pernst eprnst repnst erpnst prnest rpnest pnrest nprest rnpest nrpest penrst epnrst pnerst nperst enprst neprst renpst ernpst rnepst nrepst enrpst nerpst presnt rpesnt persnt eprsnt repsnt erpsnt prsent rpsent psrent sprent rspent srpent pesrnt epsrnt psernt spernt esprnt seprnt respnt erspnt rsepnt srepnt esrpnt serpnt prnset rpnset pnrset nprset rnpset nrpset prsnet rpsnet psrnet sprnet rspnet srpnet pnsret npsret psnret spnret nspret snpret rnspet nrspet rsnpet srnpet nsrpet snrpet pensrt epnsrt pnesrt npesrt enpsrt nepsrt pesnrt epsnrt psenrt spenrt espnrt sepnrt pnsert npsert psnert spnert nspert snpert ensprt nesprt esnprt senprt nseprt sneprt renspt ernspt rnespt nrespt enrspt nerspt resnpt ersnpt rsenpt srenpt esrnpt sernpt rnsept nrsept rsnept srnept nsrept snrept ensrpt nesrpt esnrpt senrpt nserpt snerpt pretsn rpetsn pertsn eprtsn reptsn erptsn prtesn rptesn ptresn tpresn rtpesn trpesn petrsn eptrsn ptersn tpersn etprsn teprsn retpsn ertpsn rtepsn trepsn etrpsn terpsn prestn rpestn perstn eprstn repstn erpstn prsetn rpsetn psretn spretn rspetn srpetn pesrtn epsrtn psertn spertn esprtn seprtn resptn ersptn rseptn sreptn esrptn serptn prtsen rptsen ptrsen tprsen rtpsen trpsen prsten rpsten psrten sprten rspten srpten ptsren tpsren pstren sptren tspren stpren rtspen trspen rstpen srtpen tsrpen strpen petsrn eptsrn ptesrn tpesrn etpsrn tepsrn pestrn epstrn psetrn spetrn esptrn septrn ptsern tpsern pstern sptern tspern stpern etsprn tesprn estprn setprn tseprn steprn retspn ertspn rtespn trespn etrspn terspn restpn erstpn rsetpn sretpn esrtpn sertpn rtsepn trsepn rstepn srtepn tsrepn strepn etsrpn tesrpn estrpn setrpn tserpn sterpn prntse rpntse pnrtse nprtse rnptse nrptse prtnse rptnse ptrnse tprnse rtpnse trpnse pntrse nptrse ptnrse tpnrse ntprse tnprse rntpse nrtpse rtnpse trnpse ntrpse tnrpse prnste rpnste pnrste nprste rnpste nrpste prsnte rpsnte psrnte sprnte rspnte srpnte pnsrte npsrte psnrte spnrte nsprte snprte rnspte nrspte rsnpte srnpte nsrpte snrpte prtsne rptsne ptrsne tprsne rtpsne trpsne prstne rpstne psrtne sprtne rsptne srptne ptsrne tpsrne pstrne sptrne tsprne stprne rtspne trspne rstpne srtpne tsrpne strpne pntsre nptsre ptnsre tpnsre ntpsre tnpsre pnstre npstre psntre spntre nsptre snptre ptsnre tpsnre pstnre sptnre tspnre stpnre ntspre tnspre nstpre sntpre tsnpre stnpre rntspe nrtspe rtnspe trnspe ntrspe tnrspe rnstpe nrstpe rsntpe srntpe nsrtpe snrtpe rtsnpe trsnpe rstnpe srtnpe tsrnpe strnpe ntsrpe tnsrpe nstrpe sntrpe tsnrpe stnrpe pentsr epntsr pnetsr npetsr enptsr neptsr petnsr eptnsr ptensr tpensr etpnsr tepnsr pntesr nptesr ptnesr tpnesr ntpesr tnpesr entpsr netpsr etnpsr tenpsr ntepsr tnepsr penstr epnstr pnestr npestr enpstr nepstr pesntr epsntr psentr spentr espntr sepntr pnsetr npsetr psnetr spnetr nspetr snpetr ensptr nesptr esnptr senptr nseptr sneptr petsnr eptsnr ptesnr tpesnr etpsnr tepsnr pestnr epstnr psetnr spetnr esptnr septnr ptsenr tpsenr pstenr sptenr tspenr stpenr etspnr tespnr estpnr setpnr tsepnr stepnr pntser nptser ptnser tpnser ntpser tnpser pnster npster psnter spnter nspter snpter ptsner tpsner pstner sptner tspner stpner ntsper tnsper nstper sntper tsnper stnper entspr netspr etnspr tenspr ntespr tnespr enstpr nestpr esntpr sentpr nsetpr snetpr etsnpr tesnpr estnpr setnpr tsenpr stenpr ntsepr tnsepr nstepr sntepr tsnepr stnepr rentsp erntsp rnetsp nretsp enrtsp nertsp retnsp ertnsp rtensp trensp etrnsp ternsp rntesp nrtesp rtnesp trnesp ntresp tnresp entrsp netrsp etnrsp tenrsp ntersp tnersp renstp ernstp rnestp nrestp enrstp nerstp resntp ersntp rsentp srentp esrntp serntp rnsetp nrsetp rsnetp srnetp nsretp snretp ensrtp nesrtp esnrtp senrtp nsertp snertp retsnp ertsnp rtesnp tresnp etrsnp tersnp restnp erstnp rsetnp sretnp esrtnp sertnp rtsenp trsenp rstenp srtenp tsrenp strenp etsrnp tesrnp estrnp setrnp tsernp sternp rntsep nrtsep rtnsep trnsep ntrsep tnrsep rnstep nrstep rsntep srntep nsrtep snrtep rtsnep trsnep rstnep srtnep tsrnep strnep ntsrep tnsrep nstrep sntrep tsnrep stnrep entsrp netsrp etnsrp tensrp ntesrp tnesrp enstrp nestrp esntrp sentrp nsetrp snetrp etsnrp tesnrp estnrp setnrp tsenrp stenrp ntserp tnserp nsterp snterp tsnerp stnerp
Note: these 'words' (valid or invalid) are all the permutations of the word prents. These words are obtained by scrambling the letters in prents.