naffs anffs nfafs fnafs afnfs fanfs naffs anffs nfafs fnafs afnfs fanfs nffas fnfas nffas fnfas ffnas ffnas affns fafns affns fafns ffans ffans nafsf anfsf nfasf fnasf afnsf fansf nasff ansff nsaff snaff asnff sanff nfsaf fnsaf nsfaf snfaf fsnaf sfnaf afsnf fasnf asfnf safnf fsanf sfanf nafsf anfsf nfasf fnasf afnsf fansf nasff ansff nsaff snaff asnff sanff nfsaf fnsaf nsfaf snfaf fsnaf sfnaf afsnf fasnf asfnf safnf fsanf sfanf nffsa fnfsa nffsa fnfsa ffnsa ffnsa nfsfa fnsfa nsffa snffa fsnfa sfnfa nfsfa fnsfa nsffa snffa fsnfa sfnfa ffsna ffsna fsfna sffna fsfna sffna affsn fafsn affsn fafsn ffasn ffasn afsfn fasfn asffn saffn fsafn sfafn afsfn fasfn asffn saffn fsafn sfafn ffsan ffsan fsfan sffan fsfan sffan
Note: these 'words' (valid or invalid) are all the permutations of the word naffs. These words are obtained by scrambling the letters in naffs.