rsusd srusd russd urssd sursd usrsd rssud srsud rssud srsud ssrud ssrud russd urssd rsusd srusd usrsd sursd susrd ussrd ssurd ssurd ussrd susrd rsuds sruds rusds ursds surds usrds rsdus srdus rdsus drsus sdrus dsrus rudss urdss rduss druss udrss durss sudrs usdrs sdurs dsurs udsrs dusrs rssdu srsdu rssdu srsdu ssrdu ssrdu rsdsu srdsu rdssu drssu sdrsu dsrsu rsdsu srdsu rdssu drssu sdrsu dsrsu ssdru ssdru sdsru dssru sdsru dssru rusds ursds rsuds sruds usrds surds rudss urdss rduss druss udrss durss rsdus srdus rdsus drsus sdrus dsrus usdrs sudrs udsrs dusrs sdurs dsurs susdr ussdr ssudr ssudr ussdr susdr sudsr usdsr sdusr dsusr udssr dussr ssdur ssdur sdsur dssur sdsur dssur usdsr sudsr udssr dussr sdusr dsusr
Note: these 'words' (valid or invalid) are all the permutations of the word rsusd. These words are obtained by scrambling the letters in rsusd.