rotis ortis rtois trois otris toris roits orits riots irots oirts iorts rtios trios ritos irtos tiros itros otirs toirs oitrs iotrs tiors itors rotsi ortsi rtosi trosi otrsi torsi rosti orsti rsoti sroti osrti sorti rtsoi trsoi rstoi srtoi tsroi stroi otsri tosri ostri sotri tsori stori roist orist riost irost oirst iorst rosit orsit rsoit sroit osrit sorit risot irsot rsiot sriot isrot sirot oisrt iosrt osirt soirt isort siort rtiso triso ritso irtso tirso itrso rtsio trsio rstio srtio tsrio strio risto irsto rsito srito isrto sirto tisro itsro tsiro stiro istro sitro otisr toisr oitsr iotsr tiosr itosr otsir tosir ostir sotir tsoir stoir oistr iostr ositr soitr isotr siotr tisor itsor tsior stior istor sitor
Note: these 'words' (valid or invalid) are all the permutations of the word rotis. These words are obtained by scrambling the letters in rotis.