trist rtist tirst itrst ritst irtst trsit rtsit tsrit strit rstit srtit tisrt itsrt tsirt stirt istrt sitrt ristt irstt rsitt sritt isrtt sirtt trits rtits tirts itrts ritts irtts trtis rttis ttris ttris rttis trtis titrs ittrs ttirs ttirs ittrs titrs ritts irtts rtits trits itrts tirts trsti rtsti tsrti strti rstti srtti trtsi rttsi ttrsi ttrsi rttsi trtsi tstri sttri ttsri ttsri sttri tstri rstti srtti rtsti trsti strti tsrti tistr itstr tsitr stitr isttr sittr titsr ittsr ttisr ttisr ittsr titsr tstir sttir ttsir ttsir sttir tstir isttr sittr itstr tistr stitr tsitr ristt irstt rsitt sritt isrtt sirtt ritst irtst rtist trist itrst tirst rstit srtit rtsit trsit strit tsrit istrt sitrt itsrt tisrt stirt tsirt
Note: these 'words' (valid or invalid) are all the permutations of the word trist. These words are obtained by scrambling the letters in trist.