busti ubsti bsuti sbuti usbti subti butsi ubtsi btusi tbusi utbsi tubsi bstui sbtui btsui tbsui stbui tsbui ustbi sutbi utsbi tusbi stubi tsubi busit ubsit bsuit sbuit usbit subit buist ubist biust ibust uibst iubst bsiut sbiut bisut ibsut sibut isbut usibt suibt uisbt iusbt siubt isubt butis ubtis btuis tbuis utbis tubis buits ubits biuts ibuts uibts iubts btius tbius bitus ibtus tibus itbus utibs tuibs uitbs iutbs tiubs itubs bstiu sbtiu btsiu tbsiu stbiu tsbiu bsitu sbitu bistu ibstu sibtu isbtu btisu tbisu bitsu ibtsu tibsu itbsu stibu tsibu sitbu istbu tisbu itsbu ustib sutib utsib tusib stuib tsuib usitb suitb uistb iustb siutb isutb utisb tuisb uitsb iutsb tiusb itusb stiub tsiub situb istub tisub itsub
Note: these 'words' (valid or invalid) are all the permutations of the word busti. These words are obtained by scrambling the letters in busti.