urson ruson usron suron rsuon sruon urosn ruosn uorsn oursn rousn orusn usorn suorn uosrn ousrn sourn osurn rsoun sroun rosun orsun sorun osrun ursno rusno usrno surno rsuno sruno urnso runso unrso nurso rnuso nruso usnro sunro unsro nusro snuro nsuro rsnuo srnuo rnsuo nrsuo snruo nsruo urons ruons uorns ourns rouns oruns urnos runos unros nuros rnuos nruos uonrs ounrs unors nuors onurs nours ronus ornus rnous nrous onrus norus usonr suonr uosnr ousnr sounr osunr usnor sunor unsor nusor snuor nsuor uonsr ounsr unosr nuosr onusr nousr sonur osnur snour nsour onsur nosur rsonu sronu rosnu orsnu sornu osrnu rsnou srnou rnsou nrsou snrou nsrou ronsu ornsu rnosu nrosu onrsu norsu sonru osnru snoru nsoru onsru nosru
Note: these 'words' (valid or invalid) are all the permutations of the word urson. These words are obtained by scrambling the letters in urson.