prefab rpefab perfab eprfab repfab erpfab prfeab rpfeab pfreab fpreab rfpeab frpeab pefrab epfrab pferab fperab efprab feprab refpab erfpab rfepab frepab efrpab ferpab preafb rpeafb perafb eprafb repafb erpafb praefb rpaefb parefb aprefb rapefb arpefb pearfb eparfb paerfb aperfb eaprfb aeprfb reapfb erapfb raepfb arepfb earpfb aerpfb prfaeb rpfaeb pfraeb fpraeb rfpaeb frpaeb prafeb rpafeb parfeb aprfeb rapfeb arpfeb pfareb fpareb pafreb apfreb fapreb afpreb rfapeb frapeb rafpeb arfpeb farpeb afrpeb pefarb epfarb pfearb fpearb efparb feparb peafrb epafrb paefrb apefrb eapfrb aepfrb pfaerb fpaerb paferb apferb faperb afperb efaprb feaprb eafprb aefprb faeprb afeprb refapb erfapb rfeapb freapb efrapb ferapb reafpb erafpb raefpb arefpb earfpb aerfpb rfaepb fraepb rafepb arfepb farepb afrepb efarpb fearpb eafrpb aefrpb faerpb aferpb prefba rpefba perfba eprfba repfba erpfba prfeba rpfeba pfreba fpreba rfpeba frpeba pefrba epfrba pferba fperba efprba feprba refpba erfpba rfepba frepba efrpba ferpba prebfa rpebfa perbfa eprbfa repbfa erpbfa prbefa rpbefa pbrefa bprefa rbpefa brpefa pebrfa epbrfa pberfa bperfa ebprfa beprfa rebpfa erbpfa rbepfa brepfa ebrpfa berpfa prfbea rpfbea pfrbea fprbea rfpbea frpbea prbfea rpbfea pbrfea bprfea rbpfea brpfea pfbrea fpbrea pbfrea bpfrea fbprea bfprea rfbpea frbpea rbfpea brfpea fbrpea bfrpea pefbra epfbra pfebra fpebra efpbra fepbra pebfra epbfra pbefra bpefra ebpfra bepfra pfbera fpbera pbfera bpfera fbpera bfpera efbpra febpra ebfpra befpra fbepra bfepra refbpa erfbpa rfebpa frebpa efrbpa ferbpa rebfpa erbfpa rbefpa brefpa ebrfpa berfpa rfbepa frbepa rbfepa brfepa fbrepa bfrepa efbrpa febrpa ebfrpa befrpa fberpa bferpa preabf rpeabf perabf eprabf repabf erpabf praebf rpaebf parebf aprebf rapebf arpebf pearbf eparbf paerbf aperbf eaprbf aeprbf reapbf erapbf raepbf arepbf earpbf aerpbf prebaf rpebaf perbaf eprbaf repbaf erpbaf prbeaf rpbeaf pbreaf bpreaf rbpeaf brpeaf pebraf epbraf pberaf bperaf ebpraf bepraf rebpaf erbpaf rbepaf brepaf ebrpaf berpaf prabef rpabef parbef aprbef rapbef arpbef prbaef rpbaef pbraef bpraef rbpaef brpaef pabref apbref pbaref bparef abpref bapref rabpef arbpef rbapef brapef abrpef barpef peabrf epabrf paebrf apebrf eapbrf aepbrf pebarf epbarf pbearf bpearf ebparf beparf paberf apberf pbaerf bpaerf abperf baperf eabprf aebprf ebaprf beaprf abeprf baeprf reabpf erabpf raebpf arebpf earbpf aerbpf rebapf erbapf rbeapf breapf ebrapf berapf rabepf arbepf rbaepf braepf abrepf barepf eabrpf aebrpf ebarpf bearpf aberpf baerpf prfabe rpfabe pfrabe fprabe rfpabe frpabe prafbe rpafbe parfbe aprfbe rapfbe arpfbe pfarbe fparbe pafrbe apfrbe faprbe afprbe rfapbe frapbe rafpbe arfpbe farpbe afrpbe prfbae rpfbae pfrbae fprbae rfpbae frpbae prbfae rpbfae pbrfae bprfae rbpfae brpfae pfbrae fpbrae pbfrae bpfrae fbprae bfprae rfbpae frbpae rbfpae brfpae fbrpae bfrpae prabfe rpabfe parbfe aprbfe rapbfe arpbfe prbafe rpbafe pbrafe bprafe rbpafe brpafe pabrfe apbrfe pbarfe bparfe abprfe baprfe rabpfe arbpfe rbapfe brapfe abrpfe barpfe pfabre fpabre pafbre apfbre fapbre afpbre pfbare fpbare pbfare bpfare fbpare bfpare pabfre apbfre pbafre bpafre abpfre bapfre fabpre afbpre fbapre bfapre abfpre bafpre rfabpe frabpe rafbpe arfbpe farbpe afrbpe rfbape frbape rbfape brfape fbrape bfrape rabfpe arbfpe rbafpe brafpe abrfpe barfpe fabrpe afbrpe fbarpe bfarpe abfrpe bafrpe pefabr epfabr pfeabr fpeabr efpabr fepabr peafbr epafbr paefbr apefbr eapfbr aepfbr pfaebr fpaebr pafebr apfebr fapebr afpebr efapbr feapbr eafpbr aefpbr faepbr afepbr pefbar epfbar pfebar fpebar efpbar fepbar pebfar epbfar pbefar bpefar ebpfar bepfar pfbear fpbear pbfear bpfear fbpear bfpear efbpar febpar ebfpar befpar fbepar bfepar peabfr epabfr paebfr apebfr eapbfr aepbfr pebafr epbafr pbeafr bpeafr ebpafr bepafr pabefr apbefr pbaefr bpaefr abpefr bapefr eabpfr aebpfr ebapfr beapfr abepfr baepfr pfaber fpaber pafber apfber fapber afpber pfbaer fpbaer pbfaer bpfaer fbpaer bfpaer pabfer apbfer pbafer bpafer abpfer bapfer fabper afbper fbaper bfaper abfper bafper efabpr feabpr eafbpr aefbpr faebpr afebpr efbapr febapr ebfapr befapr fbeapr bfeapr eabfpr aebfpr ebafpr beafpr abefpr baefpr fabepr afbepr fbaepr bfaepr abfepr bafepr refabp erfabp rfeabp freabp efrabp ferabp reafbp erafbp raefbp arefbp earfbp aerfbp rfaebp fraebp rafebp arfebp farebp afrebp efarbp fearbp eafrbp aefrbp faerbp aferbp refbap erfbap rfebap frebap efrbap ferbap rebfap erbfap rbefap brefap ebrfap berfap rfbeap frbeap rbfeap brfeap fbreap bfreap efbrap febrap ebfrap befrap fberap bferap reabfp erabfp raebfp arebfp earbfp aerbfp rebafp erbafp rbeafp breafp ebrafp berafp rabefp arbefp rbaefp braefp abrefp barefp eabrfp aebrfp ebarfp bearfp aberfp baerfp rfabep frabep rafbep arfbep farbep afrbep rfbaep frbaep rbfaep brfaep fbraep bfraep rabfep arbfep rbafep brafep abrfep barfep fabrep afbrep fbarep bfarep abfrep bafrep efabrp feabrp eafbrp aefbrp faebrp afebrp efbarp febarp ebfarp befarp fbearp bfearp eabfrp aebfrp ebafrp beafrp abefrp baefrp faberp afberp fbaerp bfaerp abferp baferp
Note: these 'words' (valid or invalid) are all the permutations of the word prefab. These words are obtained by scrambling the letters in prefab.