xixl ixxl xxil xxil ixxl xixl xilx ixlx xlix lxix ilxx lixx xxli xxli xlxi lxxi xlxi lxxi ixlx xilx ilxx lixx xlix lxix
Note: these 'words' (valid or invalid) are all the permutations of the word xixl. These words are obtained by scrambling the letters in xixl.