wdug dwug wudg uwdg duwg udwg wdgu dwgu wgdu gwdu dgwu gdwu wugd uwgd wgud gwud ugwd guwd dugw udgw dguw gduw ugdw gudw
Note: these 'words' (valid or invalid) are all the permutations of the word wdug. These words are obtained by scrambling the letters in wdug.