unods nuods uonds ounds nouds onuds undos nudos udnos dunos nduos dnuos uodns oudns udons duons oduns douns nodus ondus ndous dnous odnus donus unosd nuosd uonsd ounsd nousd onusd unsod nusod usnod sunod nsuod snuod uosnd ousnd usond suond osund sound nosud onsud nsoud snoud osnud sonud undso nudso udnso dunso nduso dnuso unsdo nusdo usndo sundo nsudo snudo udsno dusno usdno sudno dsuno sduno ndsuo dnsuo nsduo snduo dsnuo sdnuo uodsn oudsn udosn duosn odusn dousn uosdn ousdn usodn suodn osudn soudn udson duson usdon sudon dsuon sduon odsun dosun osdun sodun dsoun sdoun nodsu ondsu ndosu dnosu odnsu donsu nosdu onsdu nsodu snodu osndu sondu ndsou dnsou nsdou sndou dsnou sdnou odsnu dosnu osdnu sodnu dsonu sdonu
Note: these 'words' (valid or invalid) are all the permutations of the word unods. These words are obtained by scrambling the letters in unods.