duping udping dpuing pduing upding puding duipng udipng diupng idupng uidpng iudpng dpiung pdiung dipung idpung pidung ipdung upidng puidng uipdng iupdng piudng ipudng dupnig udpnig dpunig pdunig updnig pudnig dunpig udnpig dnupig ndupig undpig nudpig dpnuig pdnuig dnpuig ndpuig pnduig npduig upndig pundig unpdig nupdig pnudig npudig duinpg udinpg diunpg idunpg uidnpg iudnpg dunipg udnipg dnuipg nduipg undipg nudipg dinupg idnupg dniupg ndiupg indupg nidupg uindpg iundpg unidpg nuidpg inudpg niudpg dpinug pdinug dipnug idpnug pidnug ipdnug dpniug pdniug dnpiug ndpiug pndiug npdiug dinpug idnpug dnipug ndipug indpug nidpug pindug ipndug pnidug npidug inpdug nipdug upindg puindg uipndg iupndg piundg ipundg upnidg punidg unpidg nupidg pnuidg npuidg uinpdg iunpdg unipdg nuipdg inupdg niupdg pinudg ipnudg pniudg npiudg inpudg nipudg dupign udpign dpuign pduign updign pudign duipgn udipgn diupgn idupgn uidpgn iudpgn dpiugn pdiugn dipugn idpugn pidugn ipdugn upidgn puidgn uipdgn iupdgn piudgn ipudgn dupgin udpgin dpugin pdugin updgin pudgin dugpin udgpin dgupin gdupin ugdpin gudpin dpguin pdguin dgpuin gdpuin pgduin gpduin upgdin pugdin ugpdin gupdin pgudin gpudin duigpn udigpn diugpn idugpn uidgpn iudgpn dugipn udgipn dguipn gduipn ugdipn gudipn digupn idgupn dgiupn gdiupn igdupn gidupn uigdpn iugdpn ugidpn guidpn igudpn giudpn dpigun pdigun dipgun idpgun pidgun ipdgun dpgiun pdgiun dgpiun gdpiun pgdiun gpdiun digpun idgpun dgipun gdipun igdpun gidpun pigdun ipgdun pgidun gpidun igpdun gipdun upigdn puigdn uipgdn iupgdn piugdn ipugdn upgidn pugidn ugpidn gupidn pguidn gpuidn uigpdn iugpdn ugipdn guipdn igupdn giupdn pigudn ipgudn pgiudn gpiudn igpudn gipudn dupngi udpngi dpungi pdungi updngi pudngi dunpgi udnpgi dnupgi ndupgi undpgi nudpgi dpnugi pdnugi dnpugi ndpugi pndugi npdugi upndgi pundgi unpdgi nupdgi pnudgi npudgi dupgni udpgni dpugni pdugni updgni pudgni dugpni udgpni dgupni gdupni ugdpni gudpni dpguni pdguni dgpuni gdpuni pgduni gpduni upgdni pugdni ugpdni gupdni pgudni gpudni dungpi udngpi dnugpi ndugpi undgpi nudgpi dugnpi udgnpi dgunpi gdunpi ugdnpi gudnpi dngupi ndgupi dgnupi gdnupi ngdupi gndupi ungdpi nugdpi ugndpi gundpi ngudpi gnudpi dpngui pdngui dnpgui ndpgui pndgui npdgui dpgnui pdgnui dgpnui gdpnui pgdnui gpdnui dngpui ndgpui dgnpui gdnpui ngdpui gndpui pngdui npgdui pgndui gpndui ngpdui gnpdui upngdi pungdi unpgdi nupgdi pnugdi npugdi upgndi pugndi ugpndi gupndi pgundi gpundi ungpdi nugpdi ugnpdi gunpdi ngupdi gnupdi pngudi npgudi pgnudi gpnudi ngpudi gnpudi duingp udingp diungp idungp uidngp iudngp dunigp udnigp dnuigp nduigp undigp nudigp dinugp idnugp dniugp ndiugp indugp nidugp uindgp iundgp unidgp nuidgp inudgp niudgp duignp udignp diugnp idugnp uidgnp iudgnp duginp udginp dguinp gduinp ugdinp gudinp digunp idgunp dgiunp gdiunp igdunp gidunp uigdnp iugdnp ugidnp guidnp igudnp giudnp dungip udngip dnugip ndugip undgip nudgip dugnip udgnip dgunip gdunip ugdnip gudnip dnguip ndguip dgnuip gdnuip ngduip gnduip ungdip nugdip ugndip gundip ngudip gnudip dingup idngup dnigup ndigup indgup nidgup dignup idgnup dginup gdinup igdnup gidnup dngiup ndgiup dgniup gdniup ngdiup gndiup ingdup nigdup igndup gindup ngidup gnidup uingdp iungdp unigdp nuigdp inugdp niugdp uigndp iugndp ugindp guindp igundp giundp ungidp nugidp ugnidp gunidp nguidp gnuidp ingudp nigudp ignudp ginudp ngiudp gniudp dpingu pdingu dipngu idpngu pidngu ipdngu dpnigu pdnigu dnpigu ndpigu pndigu npdigu dinpgu idnpgu dnipgu ndipgu indpgu nidpgu pindgu ipndgu pnidgu npidgu inpdgu nipdgu dpignu pdignu dipgnu idpgnu pidgnu ipdgnu dpginu pdginu dgpinu gdpinu pgdinu gpdinu digpnu idgpnu dgipnu gdipnu igdpnu gidpnu pigdnu ipgdnu pgidnu gpidnu igpdnu gipdnu dpngiu pdngiu dnpgiu ndpgiu pndgiu npdgiu dpgniu pdgniu dgpniu gdpniu pgdniu gpdniu dngpiu ndgpiu dgnpiu gdnpiu ngdpiu gndpiu pngdiu npgdiu pgndiu gpndiu ngpdiu gnpdiu dingpu idngpu dnigpu ndigpu indgpu nidgpu dignpu idgnpu dginpu gdinpu igdnpu gidnpu dngipu ndgipu dgnipu gdnipu ngdipu gndipu ingdpu nigdpu igndpu gindpu ngidpu gnidpu pingdu ipngdu pnigdu npigdu inpgdu nipgdu pigndu ipgndu pgindu gpindu igpndu gipndu pngidu npgidu pgnidu gpnidu ngpidu gnpidu ingpdu nigpdu ignpdu ginpdu ngipdu gnipdu upingd puingd uipngd iupngd piungd ipungd upnigd punigd unpigd nupigd pnuigd npuigd uinpgd iunpgd unipgd nuipgd inupgd niupgd pinugd ipnugd pniugd npiugd inpugd nipugd upignd puignd uipgnd iupgnd piugnd ipugnd upgind pugind ugpind gupind pguind gpuind uigpnd iugpnd ugipnd guipnd igupnd giupnd pigund ipgund pgiund gpiund igpund gipund upngid pungid unpgid nupgid pnugid npugid upgnid pugnid ugpnid gupnid pgunid gpunid ungpid nugpid ugnpid gunpid ngupid gnupid pnguid npguid pgnuid gpnuid ngpuid gnpuid uingpd iungpd unigpd nuigpd inugpd niugpd uignpd iugnpd uginpd guinpd igunpd giunpd ungipd nugipd ugnipd gunipd nguipd gnuipd ingupd nigupd ignupd ginupd ngiupd gniupd pingud ipngud pnigud npigud inpgud nipgud pignud ipgnud pginud gpinud igpnud gipnud pngiud npgiud pgniud gpniud ngpiud gnpiud ingpud nigpud ignpud ginpud ngipud gnipud
Note: these 'words' (valid or invalid) are all the permutations of the word duping. These words are obtained by scrambling the letters in duping.