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