nuffs unffs nfufs fnufs ufnfs funfs nuffs unffs nfufs fnufs ufnfs funfs nffus fnfus nffus fnfus ffnus ffnus uffns fufns uffns fufns ffuns ffuns nufsf unfsf nfusf fnusf ufnsf funsf nusff unsff nsuff snuff usnff sunff nfsuf fnsuf nsfuf snfuf fsnuf sfnuf ufsnf fusnf usfnf sufnf fsunf sfunf nufsf unfsf nfusf fnusf ufnsf funsf nusff unsff nsuff snuff usnff sunff nfsuf fnsuf nsfuf snfuf fsnuf sfnuf ufsnf fusnf usfnf sufnf fsunf sfunf nffsu fnfsu nffsu fnfsu ffnsu ffnsu nfsfu fnsfu nsffu snffu fsnfu sfnfu nfsfu fnsfu nsffu snffu fsnfu sfnfu ffsnu ffsnu fsfnu sffnu fsfnu sffnu uffsn fufsn uffsn fufsn ffusn ffusn ufsfn fusfn usffn suffn fsufn sfufn ufsfn fusfn usffn suffn fsufn sfufn ffsun ffsun fsfun sffun fsfun sffun
Note: these 'words' (valid or invalid) are all the permutations of the word nuffs. These words are obtained by scrambling the letters in nuffs.