uubet uubet ubuet buuet ubuet buuet uuebt uuebt ueubt euubt ueubt euubt ubeut bueut uebut eubut beuut ebuut ubeut bueut uebut eubut beuut ebuut uubte uubte ubute buute ubute buute uutbe uutbe utube tuube utube tuube ubtue butue utbue tubue btuue tbuue ubtue butue utbue tubue btuue tbuue uuetb uuetb ueutb euutb ueutb euutb uuteb uuteb utueb tuueb utueb tuueb uetub eutub uteub tueub etuub teuub uetub eutub uteub tueub etuub teuub ubetu buetu uebtu eubtu beutu ebutu ubteu buteu utbeu tubeu btueu tbueu uetbu eutbu utebu tuebu etubu teubu betuu ebtuu bteuu tbeuu etbuu tebuu ubetu buetu uebtu eubtu beutu ebutu ubteu buteu utbeu tubeu btueu tbueu uetbu eutbu utebu tuebu etubu teubu betuu ebtuu bteuu tbeuu etbuu tebuu
Note: these 'words' (valid or invalid) are all the permutations of the word uubet. These words are obtained by scrambling the letters in uubet.