nudre undre ndure dnure udnre dunre nurde unrde nrude rnude urnde runde ndrue dnrue nrdue rndue drnue rdnue udrne durne urdne rudne drune rdune nuder under nduer dnuer udner duner nuedr unedr neudr enudr uendr eundr ndeur dneur nedur endur denur ednur udenr duenr uednr eudnr deunr edunr nured unred nrued rnued urned runed nuerd unerd neurd enurd uenrd eunrd nreud rneud nerud enrud renud ernud urend ruend uernd eurnd reund erund ndreu dnreu nrdeu rndeu drneu rdneu nderu dneru nedru endru denru ednru nredu rnedu nerdu enrdu rendu erndu drenu rdenu dernu edrnu rednu erdnu udren duren urden ruden druen rduen udern duern uedrn eudrn deurn edurn uredn ruedn uerdn eurdn reudn erudn dreun rdeun derun edrun redun erdun
Note: these 'words' (valid or invalid) are all the permutations of the word nudre. These words are obtained by scrambling the letters in nudre.