undee nudee udnee dunee nduee dnuee unede nuede uende eunde neude enude udene duene uedne eudne deune edune ndeue dneue nedue endue denue ednue undee nudee udnee dunee nduee dnuee unede nuede uende eunde neude enude udene duene uedne eudne deune edune ndeue dneue nedue endue denue ednue uneed nueed uened euned neued enued uneed nueed uened euned neued enued ueend euend ueend euend eeund eeund neeud eneud neeud eneud eenud eenud udeen dueen ueden euden deuen eduen udeen dueen ueden euden deuen eduen ueedn euedn ueedn euedn eeudn eeudn deeun edeun deeun edeun eedun eedun ndeeu dneeu nedeu endeu deneu edneu ndeeu dneeu nedeu endeu deneu edneu needu enedu needu enedu eendu eendu deenu edenu deenu edenu eednu eednu
Note: these 'words' (valid or invalid) are all the permutations of the word undee. These words are obtained by scrambling the letters in undee.