brrr rbrr brrr rbrr rrbr rrbr brrr rbrr brrr rbrr rrbr rrbr brrr rbrr brrr rbrr rrbr rrbr rrrb rrrb rrrb rrrb rrrb rrrb
Note: these 'words' (valid or invalid) are all the permutations of the word brrr. These words are obtained by scrambling the letters in brrr.