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