musty umsty msuty smuty usmty sumty mutsy umtsy mtusy tmusy utmsy tumsy mstuy smtuy mtsuy tmsuy stmuy tsmuy ustmy sutmy utsmy tusmy stumy tsumy musyt umsyt msuyt smuyt usmyt sumyt muyst umyst myust ymust uymst yumst msyut smyut mysut ymsut symut ysmut usymt suymt uysmt yusmt syumt ysumt mutys umtys mtuys tmuys utmys tumys muyts umyts myuts ymuts uymts yumts mtyus tmyus mytus ymtus tymus ytmus utyms tuyms uytms yutms tyums ytums mstyu smtyu mtsyu tmsyu stmyu tsmyu msytu smytu mystu ymstu symtu ysmtu mtysu tmysu mytsu ymtsu tymsu ytmsu stymu tsymu sytmu ystmu tysmu ytsmu ustym sutym utsym tusym stuym tsuym usytm suytm uystm yustm syutm ysutm utysm tuysm uytsm yutsm tyusm ytusm styum tsyum sytum ystum tysum ytsum
Note: these 'words' (valid or invalid) are all the permutations of the word musty. These words are obtained by scrambling the letters in musty.