pterin tperin petrin eptrin teprin etprin ptrein tprein prtein rptein trpein rtpein pertin eprtin pretin rpetin erptin reptin terpin etrpin trepin rtepin ertpin retpin pteirn tpeirn petirn eptirn tepirn etpirn ptiern tpiern pitern iptern tipern itpern peitrn epitrn pietrn ipetrn eiptrn ieptrn teiprn etiprn tieprn iteprn eitprn ietprn ptrien tprien prtien rptien trpien rtpien ptiren tpiren pitren iptren tipren itpren priten rpiten pirten iprten ripten irpten tripen rtipen tirpen itrpen ritpen irtpen peritn epritn preitn rpeitn erpitn repitn peirtn epirtn piertn ipertn eiprtn ieprtn prietn rpietn piretn ipretn ripetn irpetn eriptn reiptn eirptn ierptn rieptn ireptn teripn etripn treipn rteipn ertipn retipn teirpn etirpn tierpn iterpn eitrpn ietrpn triepn rtiepn tirepn itrepn ritepn irtepn eritpn reitpn eirtpn iertpn rietpn iretpn pterni tperni petrni eptrni teprni etprni ptreni tpreni prteni rpteni trpeni rtpeni pertni eprtni pretni rpetni erptni reptni terpni etrpni trepni rtepni ertpni retpni ptenri tpenri petnri eptnri tepnri etpnri ptneri tpneri pnteri npteri tnperi ntperi pentri epntri pnetri npetri enptri neptri tenpri etnpri tnepri ntepri entpri netpri ptrnei tprnei prtnei rptnei trpnei rtpnei ptnrei tpnrei pntrei nptrei tnprei ntprei prntei rpntei pnrtei nprtei rnptei nrptei trnpei rtnpei tnrpei ntrpei rntpei nrtpei pernti eprnti prenti rpenti erpnti repnti penrti epnrti pnerti nperti enprti neprti prneti rpneti pnreti npreti rnpeti nrpeti ernpti renpti enrpti nerpti rnepti nrepti ternpi etrnpi trenpi rtenpi ertnpi retnpi tenrpi etnrpi tnerpi nterpi entrpi netrpi trnepi rtnepi tnrepi ntrepi rntepi nrtepi erntpi rentpi enrtpi nertpi rnetpi nretpi pteinr tpeinr petinr eptinr tepinr etpinr ptienr tpienr pitenr iptenr tipenr itpenr peitnr epitnr pietnr ipetnr eiptnr ieptnr teipnr etipnr tiepnr itepnr eitpnr ietpnr ptenir tpenir petnir eptnir tepnir etpnir ptneir tpneir pnteir npteir tnpeir ntpeir pentir epntir pnetir npetir enptir neptir tenpir etnpir tnepir ntepir entpir netpir ptiner tpiner pitner iptner tipner itpner ptnier tpnier pntier nptier tnpier ntpier pinter ipnter pniter npiter inpter nipter tinper itnper tniper ntiper intper nitper peintr epintr pientr ipentr eipntr iepntr penitr epnitr pneitr npeitr enpitr nepitr pinetr ipnetr pnietr npietr inpetr nipetr einptr ienptr eniptr neiptr ineptr nieptr teinpr etinpr tienpr itenpr eitnpr ietnpr tenipr etnipr tneipr nteipr entipr netipr tinepr itnepr tniepr ntiepr intepr nitepr eintpr ientpr enitpr neitpr inetpr nietpr ptrine tprine prtine rptine trpine rtpine ptirne tpirne pitrne iptrne tiprne itprne pritne rpitne pirtne iprtne riptne irptne tripne rtipne tirpne itrpne ritpne irtpne ptrnie tprnie prtnie rptnie trpnie rtpnie ptnrie tpnrie pntrie nptrie tnprie ntprie prntie rpntie pnrtie nprtie rnptie nrptie trnpie rtnpie tnrpie ntrpie rntpie nrtpie ptinre tpinre pitnre iptnre tipnre itpnre ptnire tpnire pntire nptire tnpire ntpire pintre ipntre pnitre npitre inptre niptre tinpre itnpre tnipre ntipre intpre nitpre printe rpinte pirnte iprnte ripnte irpnte prnite rpnite pnrite nprite rnpite nrpite pinrte ipnrte pnirte npirte inprte niprte rinpte irnpte rnipte nripte inrpte nirpte trinpe rtinpe tirnpe itrnpe ritnpe irtnpe trnipe rtnipe tnripe ntripe rntipe nrtipe tinrpe itnrpe tnirpe ntirpe intrpe nitrpe rintpe irntpe rnitpe nritpe inrtpe nirtpe perint eprint preint rpeint erpint repint peirnt epirnt piernt ipernt eiprnt ieprnt prient rpient pirent iprent ripent irpent eripnt reipnt eirpnt ierpnt riepnt irepnt pernit eprnit prenit rpenit erpnit repnit penrit epnrit pnerit nperit enprit neprit prneit rpneit pnreit npreit rnpeit nrpeit ernpit renpit enrpit nerpit rnepit nrepit peinrt epinrt pienrt ipenrt eipnrt iepnrt penirt epnirt pneirt npeirt enpirt nepirt pinert ipnert pniert npiert inpert nipert einprt ienprt eniprt neiprt ineprt nieprt prinet rpinet pirnet iprnet ripnet irpnet prniet rpniet pnriet npriet rnpiet nrpiet pinret ipnret pniret npiret inpret nipret rinpet irnpet rnipet nripet inrpet nirpet erinpt reinpt eirnpt iernpt rienpt irenpt ernipt renipt enript neript rneipt nreipt einrpt ienrpt enirpt neirpt inerpt nierpt rinept irnept rniept nriept inrept nirept terinp etrinp treinp rteinp ertinp retinp teirnp etirnp tiernp iternp eitrnp ietrnp trienp rtienp tirenp itrenp ritenp irtenp eritnp reitnp eirtnp iertnp rietnp iretnp ternip etrnip trenip rtenip ertnip retnip tenrip etnrip tnerip nterip entrip netrip trneip rtneip tnreip ntreip rnteip nrteip erntip rentip enrtip nertip rnetip nretip teinrp etinrp tienrp itenrp eitnrp ietnrp tenirp etnirp tneirp nteirp entirp netirp tinerp itnerp tnierp ntierp interp niterp eintrp ientrp enitrp neitrp inetrp nietrp trinep rtinep tirnep itrnep ritnep irtnep trniep rtniep tnriep ntriep rntiep nrtiep tinrep itnrep tnirep ntirep intrep nitrep rintep irntep rnitep nritep inrtep nirtep erintp reintp eirntp ierntp rientp irentp ernitp renitp enritp neritp rneitp nreitp einrtp ienrtp enirtp neirtp inertp niertp rinetp irnetp rnietp nrietp inretp niretp
Note: these 'words' (valid or invalid) are all the permutations of the word pterin. These words are obtained by scrambling the letters in pterin.