hkji khji hjki jhki kjhi jkhi hkij khij hikj ihkj kihj ikhj hjik jhik hijk ihjk jihk ijhk kjih jkih kijh ikjh jikh ijkh
Note: these 'words' (valid or invalid) are all the permutations of the word hkji. These words are obtained by scrambling the letters in hkji.