huff uhff hfuf fhuf ufhf fuhf huff uhff hfuf fhuf ufhf fuhf hffu fhfu hffu fhfu ffhu ffhu uffh fufh uffh fufh ffuh ffuh
Note: these 'words' (valid or invalid) are all the permutations of the word huff. These words are obtained by scrambling the letters in huff.