snafu nsafu sanfu asnfu nasfu ansfu snfau nsfau sfnau fsnau nfsau fnsau safnu asfnu sfanu fsanu afsnu fasnu nafsu anfsu nfasu fnasu afnsu fansu snauf nsauf sanuf asnuf nasuf ansuf snuaf nsuaf sunaf usnaf nusaf unsaf saunf asunf suanf usanf ausnf uasnf nausf anusf nuasf unasf aunsf uansf snfua nsfua sfnua fsnua nfsua fnsua snufa nsufa sunfa usnfa nusfa unsfa sfuna fsuna sufna usfna fusna ufsna nfusa fnusa nufsa unfsa funsa ufnsa safun asfun sfaun fsaun afsun fasun saufn asufn suafn usafn ausfn uasfn sfuan fsuan sufan usfan fusan ufsan afusn fausn aufsn uafsn fuasn ufasn nafus anfus nfaus fnaus afnus fanus naufs anufs nuafs unafs aunfs uanfs nfuas fnuas nufas unfas funas ufnas afuns fauns aufns uafns fuans ufans
Note: these 'words' (valid or invalid) are all the permutations of the word snafu. These words are obtained by scrambling the letters in snafu.