buroo ubroo bruoo rbuoo urboo ruboo buoro uboro bouro oburo uobro oubro brouo rbouo boruo obruo robuo orbuo urobo ruobo uorbo ourbo roubo orubo buroo ubroo bruoo rbuoo urboo ruboo buoro uboro bouro oburo uobro oubro brouo rbouo boruo obruo robuo orbuo urobo ruobo uorbo ourbo roubo orubo buoor uboor bouor obuor uobor oubor buoor uboor bouor obuor uobor oubor boour obour boour obour oobur oobur uoobr ouobr uoobr ouobr ooubr ooubr broou rboou borou obrou robou orbou broou rboou borou obrou robou orbou booru oboru booru oboru oobru oobru roobu orobu roobu orobu oorbu oorbu uroob ruoob uorob ourob rouob oruob uroob ruoob uorob ourob rouob oruob uoorb ouorb uoorb ouorb oourb oourb rooub oroub rooub oroub oorub oorub
Note: these 'words' (valid or invalid) are all the permutations of the word buroo. These words are obtained by scrambling the letters in buroo.