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