xyia yxia xiya ixya yixa iyxa xyai yxai xayi axyi yaxi ayxi xiay ixay xaiy axiy iaxy aixy yiax iyax yaix ayix iayx aiyx
Note: these 'words' (valid or invalid) are all the permutations of the word xyia. These words are obtained by scrambling the letters in xyia.