vikk ivkk vkik kvik ikvk kivk vikk ivkk vkik kvik ikvk kivk vkki kvki vkki kvki kkvi kkvi ikkv kikv ikkv kikv kkiv kkiv
Note: these 'words' (valid or invalid) are all the permutations of the word vikk. These words are obtained by scrambling the letters in vikk.