rudas urdas rduas druas udras duras ruads urads rauds aruds uards aurds rdaus draus radus ardus darus adrus udars duars uadrs audrs daurs adurs rudsa urdsa rdusa drusa udrsa dursa rusda ursda rsuda sruda usrda surda rdsua drsua rsdua srdua dsrua sdrua udsra dusra usdra sudra dsura sdura ruasd urasd rausd arusd uarsd aursd rusad ursad rsuad sruad usrad surad rasud arsud rsaud sraud asrud sarud uasrd ausrd usard suard asurd saurd rdasu drasu radsu ardsu darsu adrsu rdsau drsau rsdau srdau dsrau sdrau rasdu arsdu rsadu sradu asrdu sardu dasru adsru dsaru sdaru asdru sadru udasr duasr uadsr audsr dausr adusr udsar dusar usdar sudar dsuar sduar uasdr ausdr usadr suadr asudr saudr dasur adsur dsaur sdaur asdur sadur
Note: these 'words' (valid or invalid) are all the permutations of the word rudas. These words are obtained by scrambling the letters in rudas.