frij rfij firj ifrj rifj irfj frji rfji fjri jfri rjfi jrfi fijr ifjr fjir jfir ijfr jifr rijf irjf rjif jrif ijrf jirf
Note: these 'words' (valid or invalid) are all the permutations of the word frij. These words are obtained by scrambling the letters in frij.