failen afilen fialen ifalen aiflen iaflen falien aflien flaien lfaien alfien lafien filaen iflaen fliaen lfiaen ilfaen lifaen ailfen ialfen alifen laifen ilafen liafen faieln afieln fiaeln ifaeln aifeln iafeln faeiln afeiln feailn efailn aefiln eafiln fiealn ifealn feialn efialn iefaln eifaln aiefln iaefln aeifln eaifln ieafln eiafln falein aflein flaein lfaein alfein lafein faelin afelin fealin efalin aeflin eaflin fleain lfeain felain eflain lefain elfain alefin laefin aelfin ealfin leafin elafin filean iflean fliean lfiean ilfean lifean fielan ifelan feilan efilan ieflan eiflan fleian lfeian felian eflian lefian elfian ilefan liefan ielfan eilfan leifan elifan ailefn ialefn aliefn laiefn ilaefn liaefn aielfn iaelfn aeilfn eailfn iealfn eialfn aleifn laeifn aelifn ealifn leaifn elaifn ileafn lieafn ielafn eilafn leiafn eliafn failne afilne fialne ifalne aiflne iaflne faline afline flaine lfaine alfine lafine filane iflane fliane lfiane ilfane lifane ailfne ialfne alifne laifne ilafne liafne fainle afinle fianle ifanle aifnle iafnle fanile afnile fnaile nfaile anfile nafile finale ifnale fniale nfiale infale nifale ainfle ianfle anifle naifle inafle niafle falnie aflnie flanie lfanie alfnie lafnie fanlie afnlie fnalie nfalie anflie naflie flnaie lfnaie fnlaie nflaie lnfaie nlfaie alnfie lanfie anlfie nalfie lnafie nlafie filnae iflnae flinae lfinae ilfnae lifnae finlae ifnlae fnilae nfilae inflae niflae flniae lfniae fnliae nfliae lnfiae nlfiae ilnfae linfae inlfae nilfae lnifae nlifae ailnfe ialnfe alinfe lainfe ilanfe lianfe ainlfe ianlfe anilfe nailfe inalfe nialfe alnife lanife anlife nalife lnaife nlaife ilnafe linafe inlafe nilafe lniafe nliafe faienl afienl fiaenl ifaenl aifenl iafenl faeinl afeinl feainl efainl aefinl eafinl fieanl ifeanl feianl efianl iefanl eifanl aiefnl iaefnl aeifnl eaifnl ieafnl eiafnl fainel afinel fianel ifanel aifnel iafnel faniel afniel fnaiel nfaiel anfiel nafiel finael ifnael fniael nfiael infael nifael ainfel ianfel anifel naifel inafel niafel faenil afenil feanil efanil aefnil eafnil faneil afneil fnaeil nfaeil anfeil nafeil fenail efnail fneail nfeail enfail nefail aenfil eanfil anefil naefil enafil neafil fienal ifenal feinal efinal iefnal eifnal fineal ifneal fnieal nfieal infeal nifeal fenial efnial fneial nfeial enfial nefial ienfal einfal inefal niefal enifal neifal aienfl iaenfl aeinfl eainfl ieanfl eianfl ainefl ianefl aniefl naiefl inaefl niaefl aenifl eanifl aneifl naeifl enaifl neaifl ienafl einafl ineafl nieafl eniafl neiafl faleni afleni flaeni lfaeni alfeni lafeni faelni afelni fealni efalni aeflni eaflni fleani lfeani felani eflani lefani elfani alefni laefni aelfni ealfni leafni elafni falnei aflnei flanei lfanei alfnei lafnei fanlei afnlei fnalei nfalei anflei naflei flnaei lfnaei fnlaei nflaei lnfaei nlfaei alnfei lanfei anlfei nalfei lnafei nlafei faenli afenli feanli efanli aefnli eafnli faneli afneli fnaeli nfaeli anfeli nafeli fenali efnali fneali nfeali enfali nefali aenfli eanfli anefli naefli enafli neafli flenai lfenai felnai eflnai lefnai elfnai flneai lfneai fnleai nfleai lnfeai nlfeai fenlai efnlai fnelai nfelai enflai neflai lenfai elnfai lnefai nlefai enlfai nelfai alenfi laenfi aelnfi ealnfi leanfi elanfi alnefi lanefi anlefi nalefi lnaefi nlaefi aenlfi eanlfi anelfi naelfi enalfi nealfi lenafi elnafi lneafi nleafi enlafi nelafi filena iflena fliena lfiena ilfena lifena fielna ifelna feilna efilna ieflna eiflna fleina lfeina felina eflina lefina elfina ilefna liefna ielfna eilfna leifna elifna filnea iflnea flinea lfinea ilfnea lifnea finlea ifnlea fnilea nfilea inflea niflea flniea lfniea fnliea nfliea lnfiea nlfiea ilnfea linfea inlfea nilfea lnifea nlifea fienla ifenla feinla efinla iefnla eifnla finela ifnela fniela nfiela infela nifela fenila efnila fneila nfeila enfila nefila ienfla einfla inefla niefla enifla neifla flenia lfenia felnia eflnia lefnia elfnia flneia lfneia fnleia nfleia lnfeia nlfeia fenlia efnlia fnelia nfelia enflia neflia lenfia elnfia lnefia nlefia enlfia nelfia ilenfa lienfa ielnfa eilnfa leinfa elinfa ilnefa linefa inlefa nilefa lniefa nliefa ienlfa einlfa inelfa nielfa enilfa neilfa lenifa elnifa lneifa nleifa enlifa nelifa ailenf ialenf alienf laienf ilaenf liaenf aielnf iaelnf aeilnf eailnf iealnf eialnf aleinf laeinf aelinf ealinf leainf elainf ileanf lieanf ielanf eilanf leianf elianf ailnef ialnef alinef lainef ilanef lianef ainlef ianlef anilef nailef inalef nialef alnief lanief anlief nalief lnaief nlaief ilnaef linaef inlaef nilaef lniaef nliaef aienlf iaenlf aeinlf eainlf ieanlf eianlf ainelf ianelf anielf naielf inaelf niaelf aenilf eanilf aneilf naeilf enailf neailf ienalf einalf inealf niealf enialf neialf alenif laenif aelnif ealnif leanif elanif alneif laneif anleif naleif lnaeif nlaeif aenlif eanlif anelif naelif enalif nealif lenaif elnaif lneaif nleaif enlaif nelaif ilenaf lienaf ielnaf eilnaf leinaf elinaf ilneaf lineaf inleaf nileaf lnieaf nlieaf ienlaf einlaf inelaf nielaf enilaf neilaf leniaf elniaf lneiaf nleiaf enliaf neliaf
Note: these 'words' (valid or invalid) are all the permutations of the word failen. These words are obtained by scrambling the letters in failen.