buend ubend beund ebund uebnd eubnd buned ubned bnued nbued unbed nubed benud ebnud bneud nbeud enbud nebud uenbd eunbd unebd nuebd enubd neubd buedn ubedn beudn ebudn uebdn eubdn buden ubden bduen dbuen udben duben bedun ebdun bdeun dbeun edbun debun uedbn eudbn udebn duebn edubn deubn bunde ubnde bnude nbude unbde nubde budne ubdne bdune dbune udbne dubne bndue nbdue bdnue dbnue ndbue dnbue undbe nudbe udnbe dunbe ndube dnube bendu ebndu bnedu nbedu enbdu nebdu bednu ebdnu bdenu dbenu edbnu debnu bndeu nbdeu bdneu dbneu ndbeu dnbeu endbu nedbu ednbu denbu ndebu dnebu uendb eundb unedb nuedb enudb neudb uednb eudnb udenb duenb edunb deunb undeb nudeb udneb duneb ndueb dnueb endub nedub ednub denub ndeub dneub
Note: these 'words' (valid or invalid) are all the permutations of the word buend. These words are obtained by scrambling the letters in buend.