shhh hshh shhh hshh hhsh hhsh shhh hshh shhh hshh hhsh hhsh shhh hshh shhh hshh hhsh hhsh hhhs hhhs hhhs hhhs hhhs hhhs
Note: these 'words' (valid or invalid) are all the permutations of the word shhh. These words are obtained by scrambling the letters in shhh.