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