breib rbeib berib ebrib rebib erbib brieb rbieb bireb ibreb ribeb irbeb beirb ebirb bierb iberb eibrb iebrb reibb eribb riebb irebb eirbb ierbb brebi rbebi berbi ebrbi rebbi erbbi brbei rbbei bbrei bbrei rbbei brbei bebri ebbri bberi bberi ebbri bebri rebbi erbbi rbebi brebi ebrbi berbi bribe rbibe birbe ibrbe ribbe irbbe brbie rbbie bbrie bbrie rbbie brbie bibre ibbre bbire bbire ibbre bibre ribbe irbbe rbibe bribe ibrbe birbe beibr ebibr biebr ibebr eibbr iebbr bebir ebbir bbeir bbeir ebbir bebir biber ibber bbier bbier ibber biber eibbr iebbr ebibr beibr ibebr biebr reibb eribb riebb irebb eirbb ierbb rebib erbib rbeib breib ebrib berib ribeb irbeb rbieb brieb ibreb bireb eibrb iebrb ebirb beirb iberb bierb
Note: these 'words' (valid or invalid) are all the permutations of the word breib. These words are obtained by scrambling the letters in breib.