bqui qbui buqi ubqi qubi uqbi bqiu qbiu biqu ibqu qibu iqbu buiq ubiq biuq ibuq uibq iubq quib uqib qiub iqub uiqb iuqb
Note: these 'words' (valid or invalid) are all the permutations of the word bqui. These words are obtained by scrambling the letters in bqui.