rusma ursma rsuma sruma usrma surma rumsa urmsa rmusa mrusa umrsa mursa rsmua srmua rmsua mrsua smrua msrua usmra sumra umsra musra smura msura rusam ursam rsuam sruam usram suram ruasm urasm rausm arusm uarsm aursm rsaum sraum rasum arsum sarum asrum usarm suarm uasrm ausrm saurm asurm rumas urmas rmuas mruas umras muras ruams urams raums arums uarms aurms rmaus mraus ramus armus marus amrus umars muars uamrs aumrs maurs amurs rsmau srmau rmsau mrsau smrau msrau rsamu sramu rasmu arsmu sarmu asrmu rmasu mrasu ramsu armsu marsu amrsu smaru msaru samru asmru masru amsru usmar sumar umsar musar smuar msuar usamr suamr uasmr ausmr saumr asumr umasr muasr uamsr aumsr mausr amusr smaur msaur samur asmur masur amsur
Note: these 'words' (valid or invalid) are all the permutations of the word rusma. These words are obtained by scrambling the letters in rusma.