nhfh hnfh nfhh fnhh hfnh fhnh nhhf hnhf nhhf hnhf hhnf hhnf nfhh fnhh nhfh hnfh fhnh hfnh hfhn fhhn hhfn hhfn fhhn hfhn
Note: these 'words' (valid or invalid) are all the permutations of the word nhfh. These words are obtained by scrambling the letters in nhfh.