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