dunes udnes dnues ndues undes nudes duens udens deuns eduns uedns eudns dneus ndeus denus ednus nedus endus uneds nueds uends eunds neuds enuds dunse udnse dnuse nduse undse nudse dusne udsne dsune sdune usdne sudne dnsue ndsue dsnue sdnue nsdue sndue unsde nusde usnde sunde nsude snude duesn udesn deusn edusn uedsn eudsn dusen udsen dsuen sduen usden suden desun edsun dseun sdeun esdun sedun uesdn eusdn usedn suedn esudn seudn dnesu ndesu densu ednsu nedsu endsu dnseu ndseu dsneu sdneu nsdeu sndeu desnu edsnu dsenu sdenu esdnu sednu nesdu ensdu nsedu snedu esndu sendu unesd nuesd uensd eunsd neusd enusd unsed nused usned suned nsued snued uesnd eusnd usend suend esund seund nesud ensud nseud sneud esnud senud
Note: these 'words' (valid or invalid) are all the permutations of the word dunes. These words are obtained by scrambling the letters in dunes.