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