ruded urded rdued drued udred dured ruedd uredd reudd erudd uerdd eurdd rdeud dreud redud erdud derud edrud uderd duerd uedrd eudrd deurd edurd rudde urdde rdude drude udrde durde rudde urdde rdude drude udrde durde rddue drdue rddue drdue ddrue ddrue uddre dudre uddre dudre ddure ddure ruedd uredd reudd erudd uerdd eurdd ruded urded rdued drued udred dured redud erdud rdeud dreud edrud derud uedrd eudrd uderd duerd edurd deurd rdedu dredu reddu erddu derdu edrdu rddeu drdeu rddeu drdeu ddreu ddreu reddu erddu rdedu dredu edrdu derdu dedru eddru dderu dderu eddru dedru udedr duedr ueddr euddr deudr edudr udder duder udder duder dduer dduer ueddr euddr udedr duedr edudr deudr dedur eddur ddeur ddeur eddur dedur
Note: these 'words' (valid or invalid) are all the permutations of the word ruded. These words are obtained by scrambling the letters in ruded.