keck ekck kcek ckek eckk cekk kekc ekkc kkec kkec ekkc kekc kcke ckke kkce kkce ckke kcke eckk cekk ekck keck ckek kcek
Note: these 'words' (valid or invalid) are all the permutations of the word keck. These words are obtained by scrambling the letters in keck.