eching cehing ehcing hecing cheing hceing ecihng ceihng eichng iechng ciehng icehng ehicng heicng eihcng iehcng hiecng ihecng chieng hcieng ciheng icheng hiceng ihceng echnig cehnig ehcnig hecnig chenig hcenig ecnhig cenhig enchig nechig cnehig ncehig ehncig hencig enhcig nehcig hnecig nhecig chneig hcneig cnheig ncheig hnceig nhceig ecinhg ceinhg eicnhg iecnhg cienhg icenhg ecnihg cenihg encihg necihg cneihg nceihg einchg ienchg enichg neichg inechg niechg cinehg icnehg cniehg nciehg incehg nicehg ehincg heincg eihncg iehncg hiencg ihencg ehnicg henicg enhicg nehicg hneicg nheicg einhcg ienhcg enihcg neihcg inehcg niehcg hinecg ihnecg hniecg nhiecg inhecg nihecg chineg hcineg cihneg ichneg hicneg ihcneg chnieg hcnieg cnhieg nchieg hncieg nhcieg cinheg icnheg cniheg nciheg incheg nicheg hinceg ihnceg hniceg nhiceg inhceg nihceg echign cehign ehcign hecign cheign hceign ecihgn ceihgn eichgn iechgn ciehgn icehgn ehicgn heicgn eihcgn iehcgn hiecgn ihecgn chiegn hciegn cihegn ichegn hicegn ihcegn echgin cehgin ehcgin hecgin chegin hcegin ecghin ceghin egchin gechin cgehin gcehin ehgcin hegcin eghcin gehcin hgecin ghecin chgein hcgein cghein gchein hgcein ghcein ecighn ceighn eicghn iecghn cieghn iceghn ecgihn cegihn egcihn gecihn cgeihn gceihn eigchn iegchn egichn geichn igechn giechn cigehn icgehn cgiehn gciehn igcehn gicehn ehigcn heigcn eihgcn iehgcn hiegcn ihegcn ehgicn hegicn eghicn gehicn hgeicn gheicn eighcn ieghcn egihcn geihcn igehcn giehcn higecn ihgecn hgiecn ghiecn ighecn gihecn chigen hcigen cihgen ichgen hicgen ihcgen chgien hcgien cghien gchien hgcien ghcien cighen icghen cgihen gcihen igchen gichen higcen ihgcen hgicen ghicen ighcen gihcen echngi cehngi ehcngi hecngi chengi hcengi ecnhgi cenhgi enchgi nechgi cnehgi ncehgi ehncgi hencgi enhcgi nehcgi hnecgi nhecgi chnegi hcnegi cnhegi nchegi hncegi nhcegi echgni cehgni ehcgni hecgni chegni hcegni ecghni ceghni egchni gechni cgehni gcehni ehgcni hegcni eghcni gehcni hgecni ghecni chgeni hcgeni cgheni gcheni hgceni ghceni ecnghi cenghi encghi necghi cneghi nceghi ecgnhi cegnhi egcnhi gecnhi cgenhi gcenhi engchi negchi egnchi genchi ngechi gnechi cngehi ncgehi cgnehi gcnehi ngcehi gncehi ehngci hengci enhgci nehgci hnegci nhegci ehgnci hegnci eghnci gehnci hgenci ghenci enghci neghci egnhci genhci ngehci gnehci hngeci nhgeci hgneci ghneci ngheci gnheci chngei hcngei cnhgei nchgei hncgei nhcgei chgnei hcgnei cghnei gchnei hgcnei ghcnei cnghei ncghei cgnhei gcnhei ngchei gnchei hngcei nhgcei hgncei ghncei nghcei gnhcei ecingh ceingh eicngh iecngh ciengh icengh ecnigh cenigh encigh necigh cneigh nceigh eincgh iencgh enicgh neicgh inecgh niecgh cinegh icnegh cniegh nciegh incegh nicegh ecignh ceignh eicgnh iecgnh ciegnh icegnh ecginh ceginh egcinh gecinh cgeinh gceinh eigcnh iegcnh egicnh geicnh igecnh giecnh cigenh icgenh cgienh gcienh igcenh gicenh ecngih cengih encgih necgih cnegih ncegih ecgnih cegnih egcnih gecnih cgenih gcenih engcih negcih egncih gencih ngecih gnecih cngeih ncgeih cgneih gcneih ngceih gnceih eingch iengch enigch neigch inegch niegch eignch iegnch eginch geinch igench giench engich negich egnich genich ngeich gneich ingech nigech ignech ginech ngiech gniech cingeh icngeh cnigeh ncigeh incgeh nicgeh cigneh icgneh cgineh gcineh igcneh gicneh cngieh ncgieh cgnieh gcnieh ngcieh gncieh ingceh nigceh ignceh ginceh ngiceh gniceh ehingc heingc eihngc iehngc hiengc ihengc ehnigc henigc enhigc nehigc hneigc nheigc einhgc ienhgc enihgc neihgc inehgc niehgc hinegc ihnegc hniegc nhiegc inhegc nihegc ehignc heignc eihgnc iehgnc hiegnc ihegnc ehginc heginc eghinc gehinc hgeinc gheinc eighnc ieghnc egihnc geihnc igehnc giehnc higenc ihgenc hgienc ghienc ighenc gihenc ehngic hengic enhgic nehgic hnegic nhegic ehgnic hegnic eghnic gehnic hgenic ghenic enghic neghic egnhic genhic ngehic gnehic hngeic nhgeic hgneic ghneic ngheic gnheic einghc ienghc enighc neighc ineghc nieghc eignhc iegnhc eginhc geinhc igenhc gienhc engihc negihc egnihc genihc ngeihc gneihc ingehc nigehc ignehc ginehc ngiehc gniehc hingec ihngec hnigec nhigec inhgec nihgec hignec ihgnec hginec ghinec ighnec gihnec hngiec nhgiec hgniec ghniec nghiec gnhiec inghec nighec ignhec ginhec ngihec gnihec chinge hcinge cihnge ichnge hicnge ihcnge chnige hcnige cnhige nchige hncige nhcige cinhge icnhge cnihge ncihge inchge nichge hincge ihncge hnicge nhicge inhcge nihcge chigne hcigne cihgne ichgne hicgne ihcgne chgine hcgine cghine gchine hgcine ghcine cighne icghne cgihne gcihne igchne gichne higcne ihgcne hgicne ghicne ighcne gihcne chngie hcngie cnhgie nchgie hncgie nhcgie chgnie hcgnie cghnie gchnie hgcnie ghcnie cnghie ncghie cgnhie gcnhie ngchie gnchie hngcie nhgcie hgncie ghncie nghcie gnhcie cinghe icnghe cnighe ncighe incghe nicghe cignhe icgnhe cginhe gcinhe igcnhe gicnhe cngihe ncgihe cgnihe gcnihe ngcihe gncihe ingche nigche ignche ginche ngiche gniche hingce ihngce hnigce nhigce inhgce nihgce hignce ihgnce hgince ghince ighnce gihnce hngice nhgice hgnice ghnice nghice gnhice inghce nighce ignhce ginhce ngihce gnihce
Note: these 'words' (valid or invalid) are all the permutations of the word eching. These words are obtained by scrambling the letters in eching.