brers rbers berrs ebrrs rebrs erbrs brres rbres brres rbres rrbes rrbes berrs ebrrs brers rbers erbrs rebrs rerbs errbs rrebs rrebs errbs rerbs bresr rbesr bersr ebrsr rebsr erbsr brser rbser bsrer sbrer rsber srber besrr ebsrr bserr sberr esbrr sebrr resbr ersbr rsebr srebr esrbr serbr brrse rbrse brrse rbrse rrbse rrbse brsre rbsre bsrre sbrre rsbre srbre brsre rbsre bsrre sbrre rsbre srbre rrsbe rrsbe rsrbe srrbe rsrbe srrbe bersr ebrsr bresr rbesr erbsr rebsr besrr ebsrr bserr sberr esbrr sebrr brser rbser bsrer sbrer rsber srber ersbr resbr esrbr serbr rsebr srebr rersb errsb rresb rresb errsb rersb resrb ersrb rserb srerb esrrb serrb rrseb rrseb rsreb srreb rsreb srreb ersrb resrb esrrb serrb rserb srerb
Note: these 'words' (valid or invalid) are all the permutations of the word brers. These words are obtained by scrambling the letters in brers.