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