sendup esndup snedup nsedup ensdup nesdup sednup esdnup sdenup dsenup edsnup desnup sndeup nsdeup sdneup dsneup ndseup dnseup endsup nedsup ednsup densup ndesup dnesup senudp esnudp sneudp nseudp ensudp nesudp seundp esundp suendp usendp eusndp uesndp snuedp nsuedp sunedp usnedp nusedp unsedp enusdp neusdp eunsdp uensdp nuesdp unesdp sedunp esdunp sdeunp dseunp edsunp desunp seudnp esudnp suednp usednp eusdnp uesdnp sduenp dsuenp sudenp usdenp dusenp udsenp edusnp deusnp eudsnp uedsnp duesnp udesnp snduep nsduep sdnuep dsnuep ndsuep dnsuep snudep nsudep sundep usndep nusdep unsdep sdunep dsunep sudnep usdnep dusnep udsnep ndusep dnusep nudsep undsep dunsep udnsep endusp nedusp ednusp denusp ndeusp dneusp enudsp neudsp eundsp uendsp nuedsp unedsp edunsp deunsp eudnsp uednsp duensp udensp nduesp dnuesp nudesp undesp dunesp udnesp sendpu esndpu snedpu nsedpu ensdpu nesdpu sednpu esdnpu sdenpu dsenpu edsnpu desnpu sndepu nsdepu sdnepu dsnepu ndsepu dnsepu endspu nedspu ednspu denspu ndespu dnespu senpdu esnpdu snepdu nsepdu enspdu nespdu sepndu espndu spendu psendu epsndu pesndu snpedu nspedu spnedu psnedu npsedu pnsedu enpsdu nepsdu epnsdu pensdu npesdu pnesdu sedpnu esdpnu sdepnu dsepnu edspnu despnu sepdnu espdnu spednu psednu epsdnu pesdnu sdpenu dspenu spdenu psdenu dpsenu pdsenu edpsnu depsnu epdsnu pedsnu dpesnu pdesnu sndpeu nsdpeu sdnpeu dsnpeu ndspeu dnspeu snpdeu nspdeu spndeu psndeu npsdeu pnsdeu sdpneu dspneu spdneu psdneu dpsneu pdsneu ndpseu dnpseu npdseu pndseu dpnseu pdnseu endpsu nedpsu ednpsu denpsu ndepsu dnepsu enpdsu nepdsu epndsu pendsu npedsu pnedsu edpnsu depnsu epdnsu pednsu dpensu pdensu ndpesu dnpesu npdesu pndesu dpnesu pdnesu senupd esnupd sneupd nseupd ensupd nesupd seunpd esunpd suenpd usenpd eusnpd uesnpd snuepd nsuepd sunepd usnepd nusepd unsepd enuspd neuspd eunspd uenspd nuespd unespd senpud esnpud snepud nsepud enspud nespud sepnud espnud spenud psenud epsnud pesnud snpeud nspeud spneud psneud npseud pnseud enpsud nepsud epnsud pensud npesud pnesud seupnd esupnd suepnd usepnd euspnd uespnd sepund espund speund pseund epsund pesund supend uspend spuend psuend upsend pusend eupsnd uepsnd epusnd peusnd upesnd puesnd snuped nsuped sunped usnped nusped unsped snpued nspued spnued psnued npsued pnsued supned uspned spuned psuned upsned pusned nupsed unpsed npused pnused upnsed punsed enupsd neupsd eunpsd uenpsd nuepsd unepsd enpusd nepusd epnusd penusd npeusd pneusd eupnsd uepnsd epunsd peunsd upensd puensd nupesd unpesd npuesd pnuesd upnesd punesd sedupn esdupn sdeupn dseupn edsupn desupn seudpn esudpn suedpn usedpn eusdpn uesdpn sduepn dsuepn sudepn usdepn dusepn udsepn eduspn deuspn eudspn uedspn duespn udespn sedpun esdpun sdepun dsepun edspun despun sepdun espdun spedun psedun epsdun pesdun sdpeun dspeun spdeun psdeun dpseun pdseun edpsun depsun epdsun pedsun dpesun pdesun seupdn esupdn suepdn usepdn euspdn uespdn sepudn espudn speudn pseudn epsudn pesudn supedn uspedn spuedn psuedn upsedn pusedn eupsdn uepsdn epusdn peusdn upesdn puesdn sdupen dsupen sudpen usdpen duspen udspen sdpuen dspuen spduen psduen dpsuen pdsuen supden uspden spuden psuden upsden pusden dupsen udpsen dpusen pdusen updsen pudsen edupsn deupsn eudpsn uedpsn duepsn udepsn edpusn depusn epdusn pedusn dpeusn pdeusn eupdsn uepdsn epudsn peudsn upedsn puedsn dupesn udpesn dpuesn pduesn updesn pudesn sndupe nsdupe sdnupe dsnupe ndsupe dnsupe snudpe nsudpe sundpe usndpe nusdpe unsdpe sdunpe dsunpe sudnpe usdnpe dusnpe udsnpe nduspe dnuspe nudspe undspe dunspe udnspe sndpue nsdpue sdnpue dsnpue ndspue dnspue snpdue nspdue spndue psndue npsdue pnsdue sdpnue dspnue spdnue psdnue dpsnue pdsnue ndpsue dnpsue npdsue pndsue dpnsue pdnsue snupde nsupde sunpde usnpde nuspde unspde snpude nspude spnude psnude npsude pnsude supnde uspnde spunde psunde upsnde pusnde nupsde unpsde npusde pnusde upnsde punsde sdupne dsupne sudpne usdpne duspne udspne sdpune dspune spdune psdune dpsune pdsune supdne uspdne spudne psudne upsdne pusdne dupsne udpsne dpusne pdusne updsne pudsne ndupse dnupse nudpse undpse dunpse udnpse ndpuse dnpuse npduse pnduse dpnuse pdnuse nupdse unpdse npudse pnudse upndse pundse dupnse udpnse dpunse pdunse updnse pudnse endups nedups ednups denups ndeups dneups enudps neudps eundps uendps nuedps unedps edunps deunps eudnps uednps duenps udenps ndueps dnueps nudeps undeps duneps udneps endpus nedpus ednpus denpus ndepus dnepus enpdus nepdus epndus pendus npedus pnedus edpnus depnus epdnus pednus dpenus pdenus ndpeus dnpeus npdeus pndeus dpneus pdneus enupds neupds eunpds uenpds nuepds unepds enpuds nepuds epnuds penuds npeuds pneuds eupnds uepnds epunds peunds upends puends nupeds unpeds npueds pnueds upneds puneds edupns deupns eudpns uedpns duepns udepns edpuns depuns epduns peduns dpeuns pdeuns eupdns uepdns epudns peudns upedns puedns dupens udpens dpuens pduens updens pudens ndupes dnupes nudpes undpes dunpes udnpes ndpues dnpues npdues pndues dpnues pdnues nupdes unpdes npudes pnudes upndes pundes dupnes udpnes dpunes pdunes updnes pudnes
Note: these 'words' (valid or invalid) are all the permutations of the word sendup. These words are obtained by scrambling the letters in sendup.