rebuo erbuo rbeuo breuo ebruo beruo reubo erubo ruebo urebo eurbo uerbo rbueo brueo rubeo urbeo bureo ubreo eburo beuro eubro uebro buero ubero rebou erbou rbeou breou ebrou berou reobu erobu roebu orebu eorbu oerbu rboeu broeu robeu orbeu boreu obreu eboru beoru eobru oebru boeru oberu reuob eruob rueob ureob eurob uerob reoub eroub roeub oreub eorub oerub ruoeb uroeb roueb orueb uoreb oureb euorb ueorb eourb oeurb uoerb ouerb rbuoe bruoe ruboe urboe buroe ubroe rboue broue robue orbue borue obrue ruobe urobe roube orube uorbe ourbe buore ubore boure obure uobre oubre ebuor beuor eubor uebor bueor ubeor ebour beour eobur oebur boeur obeur euobr ueobr eoubr oeubr uoebr ouebr buoer uboer bouer obuer uober ouber
Note: these 'words' (valid or invalid) are all the permutations of the word rebuo. These words are obtained by scrambling the letters in rebuo.