rills irlls rlils lrils ilrls lirls rills irlls rlils lrils ilrls lirls rllis lrlis rllis lrlis llris llris illrs lilrs illrs lilrs llirs llirs rilsl irlsl rlisl lrisl ilrsl lirsl risll irsll rsill srill isrll sirll rlsil lrsil rslil srlil lsril slril ilsrl lisrl islrl silrl lsirl slirl rilsl irlsl rlisl lrisl ilrsl lirsl risll irsll rsill srill isrll sirll rlsil lrsil rslil srlil lsril slril ilsrl lisrl islrl silrl lsirl slirl rllsi lrlsi rllsi lrlsi llrsi llrsi rlsli lrsli rslli srlli lsrli slrli rlsli lrsli rslli srlli lsrli slrli llsri llsri lslri sllri lslri sllri illsr lilsr illsr lilsr llisr llisr ilslr lislr isllr sillr lsilr slilr ilslr lislr isllr sillr lsilr slilr llsir llsir lslir sllir lslir sllir
Note: these 'words' (valid or invalid) are all the permutations of the word rills. These words are obtained by scrambling the letters in rills.