kiyb ikyb kyib ykib iykb yikb kiby ikby kbiy bkiy ibky biky kybi ykbi kbyi bkyi ybki byki iybk yibk ibyk biyk ybik byik
Note: these 'words' (valid or invalid) are all the permutations of the word kiyb. These words are obtained by scrambling the letters in kiyb.