futon ufton ftuon tfuon utfon tufon fuotn ufotn foutn ofutn uoftn ouftn ftoun tfoun fotun oftun tofun otfun utofn tuofn uotfn outfn toufn otufn futno uftno ftuno tfuno utfno tufno funto ufnto fnuto nfuto unfto nufto ftnuo tfnuo fntuo nftuo tnfuo ntfuo utnfo tunfo untfo nutfo tnufo ntufo fuont ufont fount ofunt uofnt oufnt funot ufnot fnuot nfuot unfot nufot fonut ofnut fnout nfout onfut nofut uonft ounft unoft nuoft onuft nouft ftonu tfonu fotnu oftnu tofnu otfnu ftnou tfnou fntou nftou tnfou ntfou fontu ofntu fnotu nfotu onftu noftu tonfu otnfu tnofu ntofu ontfu notfu utonf tuonf uotnf outnf tounf otunf utnof tunof untof nutof tnuof ntuof uontf ountf unotf nuotf onutf noutf tonuf otnuf tnouf ntouf ontuf notuf
Note: these 'words' (valid or invalid) are all the permutations of the word futon. These words are obtained by scrambling the letters in futon.