ruths urths rtuhs truhs utrhs turhs ruhts urhts rhuts hruts uhrts hurts rthus trhus rhtus hrtus thrus htrus uthrs tuhrs uhtrs hutrs thurs hturs rutsh urtsh rtush trush utrsh tursh rusth ursth rsuth sruth usrth surth rtsuh trsuh rstuh srtuh tsruh struh utsrh tusrh ustrh sutrh tsurh sturh ruhst urhst rhust hrust uhrst hurst rusht ursht rsuht sruht usrht surht rhsut hrsut rshut srhut hsrut shrut uhsrt husrt ushrt suhrt hsurt shurt rthsu trhsu rhtsu hrtsu thrsu htrsu rtshu trshu rsthu srthu tsrhu strhu rhstu hrstu rshtu srhtu hsrtu shrtu thsru htsru tshru sthru hstru shtru uthsr tuhsr uhtsr hutsr thusr htusr utshr tushr usthr suthr tsuhr stuhr uhstr hustr ushtr suhtr hsutr shutr thsur htsur tshur sthur hstur shtur
Note: these 'words' (valid or invalid) are all the permutations of the word ruths. These words are obtained by scrambling the letters in ruths.