unpens nupens upnens punens npuens pnuens unepns nuepns uenpns eunpns neupns enupns upenns puenns uepnns eupnns peunns epunns npeuns pneuns nepuns enpuns penuns epnuns unpnes nupnes upnnes punnes npunes pnunes unnpes nunpes unnpes nunpes nnupes nnupes upnnes punnes unpnes nupnes pnunes npunes npnues pnnues nnpues nnpues pnnues npnues unenps nuenps uennps eunnps neunps enunps unneps nuneps unneps nuneps nnueps nnueps uennps eunnps unenps nuenps enunps neunps nenups ennups nneups nneups ennups nenups upenns puenns uepnns eupnns peunns epunns upnens punens unpens nupens pnuens npuens uenpns eunpns unepns nuepns enupns neupns penuns epnuns pneuns npeuns enpuns nepuns npenus pnenus nepnus enpnus pennus epnnus npneus pnneus nnpeus nnpeus pnneus npneus nenpus ennpus nnepus nnepus ennpus nenpus pennus epnnus pnenus npenus enpnus nepnus unpesn nupesn upnesn punesn npuesn pnuesn unepsn nuepsn uenpsn eunpsn neupsn enupsn upensn puensn uepnsn eupnsn peunsn epunsn npeusn pneusn nepusn enpusn penusn epnusn unpsen nupsen upnsen punsen npusen pnusen unspen nuspen usnpen sunpen nsupen snupen upsnen pusnen uspnen supnen psunen spunen npsuen pnsuen nspuen snpuen psnuen spnuen unespn nuespn uenspn eunspn neuspn enuspn unsepn nusepn usnepn sunepn nsuepn snuepn uesnpn eusnpn usenpn suenpn esunpn seunpn nesupn ensupn nseupn sneupn esnupn senupn upesnn puesnn uepsnn eupsnn peusnn epusnn upsenn pusenn uspenn supenn psuenn spuenn uespnn euspnn usepnn suepnn esupnn seupnn pesunn epsunn pseunn speunn espunn sepunn npesun pnesun nepsun enpsun pensun epnsun npseun pnseun nspeun snpeun psneun spneun nespun enspun nsepun snepun esnpun senpun pesnun epsnun psenun spenun espnun sepnun unpnse nupnse upnnse punnse npunse pnunse unnpse nunpse unnpse nunpse nnupse nnupse upnnse punnse unpnse nupnse pnunse npunse npnuse pnnuse nnpuse nnpuse pnnuse npnuse unpsne nupsne upnsne punsne npusne pnusne unspne nuspne usnpne sunpne nsupne snupne upsnne pusnne uspnne supnne psunne spunne npsune pnsune nspune snpune psnune spnune unnspe nunspe unnspe nunspe nnuspe nnuspe unsnpe nusnpe usnnpe sunnpe nsunpe snunpe unsnpe nusnpe usnnpe sunnpe nsunpe snunpe nnsupe nnsupe nsnupe snnupe nsnupe snnupe upnsne punsne unpsne nupsne pnusne npusne upsnne pusnne uspnne supnne psunne spunne unspne nuspne usnpne sunpne nsupne snupne pnsune npsune psnune spnune nspune snpune npnsue pnnsue nnpsue nnpsue pnnsue npnsue npsnue pnsnue nspnue snpnue psnnue spnnue nnspue nnspue nsnpue snnpue nsnpue snnpue pnsnue npsnue psnnue spnnue nspnue snpnue unensp nuensp uennsp eunnsp neunsp enunsp unnesp nunesp unnesp nunesp nnuesp nnuesp uennsp eunnsp unensp nuensp enunsp neunsp nenusp ennusp nneusp nneusp ennusp nenusp unesnp nuesnp uensnp eunsnp neusnp enusnp unsenp nusenp usnenp sunenp nsuenp snuenp uesnnp eusnnp usennp suennp esunnp seunnp nesunp ensunp nseunp sneunp esnunp senunp unnsep nunsep unnsep nunsep nnusep nnusep unsnep nusnep usnnep sunnep nsunep snunep unsnep nusnep usnnep sunnep nsunep snunep nnsuep nnsuep nsnuep snnuep nsnuep snnuep uensnp eunsnp unesnp nuesnp enusnp neusnp uesnnp eusnnp usennp suennp esunnp seunnp unsenp nusenp usnenp sunenp nsuenp snuenp ensunp nesunp esnunp senunp nseunp sneunp nensup ennsup nnesup nnesup ennsup nensup nesnup ensnup nsenup snenup esnnup sennup nnseup nnseup nsneup snneup nsneup snneup ensnup nesnup esnnup sennup nsenup snenup upensn puensn uepnsn eupnsn peunsn epunsn upnesn punesn unpesn nupesn pnuesn npuesn uenpsn eunpsn unepsn nuepsn enupsn neupsn penusn epnusn pneusn npeusn enpusn nepusn upesnn puesnn uepsnn eupsnn peusnn epusnn upsenn pusenn uspenn supenn psuenn spuenn uespnn euspnn usepnn suepnn esupnn seupnn pesunn epsunn pseunn speunn espunn sepunn upnsen punsen unpsen nupsen pnusen npusen upsnen pusnen uspnen supnen psunen spunen unspen nuspen usnpen sunpen nsupen snupen pnsuen npsuen psnuen spnuen nspuen snpuen uenspn eunspn unespn nuespn enuspn neuspn uesnpn eusnpn usenpn suenpn esunpn seunpn unsepn nusepn usnepn sunepn nsuepn snuepn ensupn nesupn esnupn senupn nseupn sneupn pensun epnsun pnesun npesun enpsun nepsun pesnun epsnun psenun spenun espnun sepnun pnseun npseun psneun spneun nspeun snpeun enspun nespun esnpun senpun nsepun snepun npensu pnensu nepnsu enpnsu pennsu epnnsu npnesu pnnesu nnpesu nnpesu pnnesu npnesu nenpsu ennpsu nnepsu nnepsu ennpsu nenpsu pennsu epnnsu pnensu npensu enpnsu nepnsu npesnu pnesnu nepsnu enpsnu pensnu epnsnu npsenu pnsenu nspenu snpenu psnenu spnenu nespnu enspnu nsepnu snepnu esnpnu senpnu pesnnu epsnnu psennu spennu espnnu sepnnu npnseu pnnseu nnpseu nnpseu pnnseu npnseu npsneu pnsneu nspneu snpneu psnneu spnneu nnspeu nnspeu nsnpeu snnpeu nsnpeu snnpeu pnsneu npsneu psnneu spnneu nspneu snpneu nenspu ennspu nnespu nnespu ennspu nenspu nesnpu ensnpu nsenpu snenpu esnnpu sennpu nnsepu nnsepu nsnepu snnepu nsnepu snnepu ensnpu nesnpu esnnpu sennpu nsenpu snenpu pensnu epnsnu pnesnu npesnu enpsnu nepsnu pesnnu epsnnu psennu spennu espnnu sepnnu pnsenu npsenu psnenu spnenu nspenu snpenu enspnu nespnu esnpnu senpnu nsepnu snepnu
Note: these 'words' (valid or invalid) are all the permutations of the word unpens. These words are obtained by scrambling the letters in unpens.