requ erqu rqeu qreu eqru qeru reuq eruq rueq ureq eurq uerq rque qrue ruqe urqe qure uqre equr qeur euqr ueqr quer uqer
Note: these 'words' (valid or invalid) are all the permutations of the word requ. These words are obtained by scrambling the letters in requ.