hqpo qhpo hpqo phqo qpho pqho hqop qhop hoqp ohqp qohp oqhp hpoq phoq hopq ohpq pohq ophq qpoh pqoh qoph oqph poqh opqh
Note: these 'words' (valid or invalid) are all the permutations of the word hqpo. These words are obtained by scrambling the letters in hqpo.