hfff fhff hfff fhff ffhf ffhf hfff fhff hfff fhff ffhf ffhf hfff fhff hfff fhff ffhf ffhf fffh fffh fffh fffh fffh fffh
Note: these 'words' (valid or invalid) are all the permutations of the word hfff. These words are obtained by scrambling the letters in hfff.