nurrs unrrs nrurs rnurs urnrs runrs nurrs unrrs nrurs rnurs urnrs runrs nrrus rnrus nrrus rnrus rrnus rrnus urrns rurns urrns rurns rruns rruns nursr unrsr nrusr rnusr urnsr runsr nusrr unsrr nsurr snurr usnrr sunrr nrsur rnsur nsrur snrur rsnur srnur ursnr rusnr usrnr surnr rsunr srunr nursr unrsr nrusr rnusr urnsr runsr nusrr unsrr nsurr snurr usnrr sunrr nrsur rnsur nsrur snrur rsnur srnur ursnr rusnr usrnr surnr rsunr srunr nrrsu rnrsu nrrsu rnrsu rrnsu rrnsu nrsru rnsru nsrru snrru rsnru srnru nrsru rnsru nsrru snrru rsnru srnru rrsnu rrsnu rsrnu srrnu rsrnu srrnu urrsn rursn urrsn rursn rrusn rrusn ursrn rusrn usrrn surrn rsurn srurn ursrn rusrn usrrn surrn rsurn srurn rrsun rrsun rsrun srrun rsrun srrun
Note: these 'words' (valid or invalid) are all the permutations of the word nurrs. These words are obtained by scrambling the letters in nurrs.