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