hmmm mhmm hmmm mhmm mmhm mmhm hmmm mhmm hmmm mhmm mmhm mmhm hmmm mhmm hmmm mhmm mmhm mmhm mmmh mmmh mmmh mmmh mmmh mmmh
Note: these 'words' (valid or invalid) are all the permutations of the word hmmm. These words are obtained by scrambling the letters in hmmm.