xsou sxou xosu oxsu soxu osxu xsuo sxuo xuso uxso suxo usxo xous oxus xuos uxos ouxs uoxs soux osux suox usox ousx uosx
Note: these 'words' (valid or invalid) are all the permutations of the word xsou. These words are obtained by scrambling the letters in xsou.