duans udans dauns aduns uadns audns dunas udnas dnuas nduas undas nudas danus adnus dnaus ndaus andus nadus uands aunds unads nuads anuds nauds duasn udasn dausn adusn uadsn audsn dusan udsan dsuan sduan usdan sudan dasun adsun dsaun sdaun asdun sadun uasdn ausdn usadn suadn asudn saudn dunsa udnsa dnusa ndusa undsa nudsa dusna udsna dsuna sduna usdna sudna dnsua ndsua dsnua sdnua nsdua sndua unsda nusda usnda sunda nsuda snuda dansu adnsu dnasu ndasu andsu nadsu dasnu adsnu dsanu sdanu asdnu sadnu dnsau ndsau dsnau sdnau nsdau sndau ansdu nasdu asndu sandu nsadu snadu uansd aunsd unasd nuasd anusd nausd uasnd ausnd usand suand asund saund unsad nusad usnad sunad nsuad snuad ansud nasud asnud sanud nsaud snaud
Note: these 'words' (valid or invalid) are all the permutations of the word duans. These words are obtained by scrambling the letters in duans.