mtnh tmnh mnth nmth tnmh ntmh mthn tmhn mhtn hmtn thmn htmn mnht nmht mhnt hmnt nhmt hnmt tnhm nthm thnm htnm nhtm hntm
Note: these 'words' (valid or invalid) are all the permutations of the word mtnh. These words are obtained by scrambling the letters in mtnh.