tofus otfus tfous ftous oftus fotus toufs otufs tuofs utofs outfs uotfs tfuos ftuos tufos utfos futos uftos ofuts fouts oufts uofts fuots ufots tofsu otfsu tfosu ftosu oftsu fotsu tosfu otsfu tsofu stofu ostfu sotfu tfsou ftsou tsfou stfou fstou sftou ofstu fostu osftu softu fsotu sfotu tousf otusf tuosf utosf outsf uotsf tosuf otsuf tsouf stouf ostuf sotuf tusof utsof tsuof stuof ustof sutof oustf uostf osutf soutf usotf suotf tfuso ftuso tufso utfso futso uftso tfsuo ftsuo tsfuo stfuo fstuo sftuo tusfo utsfo tsufo stufo ustfo sutfo fusto ufsto fsuto sfuto usfto sufto ofust foust oufst uofst fuost ufost ofsut fosut osfut sofut fsout sfout ousft uosft osuft souft usoft suoft fusot ufsot fsuot sfuot usfot sufot
Note: these 'words' (valid or invalid) are all the permutations of the word tofus. These words are obtained by scrambling the letters in tofus.