ribber irbber rbiber briber ibrber birber ribber irbber rbiber briber ibrber birber rbbier brbier rbbier brbier bbrier bbrier ibbrer bibrer ibbrer bibrer bbirer bbirer ribebr irbebr rbiebr briebr ibrebr birebr riebbr irebbr reibbr eribbr ierbbr eirbbr rbeibr breibr rebibr erbibr beribr ebribr iberbr bierbr iebrbr eibrbr beirbr ebirbr ribebr irbebr rbiebr briebr ibrebr birebr riebbr irebbr reibbr eribbr ierbbr eirbbr rbeibr breibr rebibr erbibr beribr ebribr iberbr bierbr iebrbr eibrbr beirbr ebirbr rbbeir brbeir rbbeir brbeir bbreir bbreir rbebir brebir rebbir erbbir berbir ebrbir rbebir brebir rebbir erbbir berbir ebrbir bberir bberir bebrir ebbrir bebrir ebbrir ibberr biberr ibberr biberr bbierr bbierr ibebrr biebrr iebbrr eibbrr beibrr ebibrr ibebrr biebrr iebbrr eibbrr beibrr ebibrr bbeirr bbeirr bebirr ebbirr bebirr ebbirr ribbre irbbre rbibre bribre ibrbre birbre ribbre irbbre rbibre bribre ibrbre birbre rbbire brbire rbbire brbire bbrire bbrire ibbrre bibrre ibbrre bibrre bbirre bbirre ribrbe irbrbe rbirbe brirbe ibrrbe birrbe rirbbe irrbbe rribbe rribbe irrbbe rirbbe rbribe brribe rrbibe rrbibe brribe rbribe ibrrbe birrbe irbrbe ribrbe brirbe rbirbe ribrbe irbrbe rbirbe brirbe ibrrbe birrbe rirbbe irrbbe rribbe rribbe irrbbe rirbbe rbribe brribe rrbibe rrbibe brribe rbribe ibrrbe birrbe irbrbe ribrbe brirbe rbirbe rbbrie brbrie rbbrie brbrie bbrrie bbrrie rbrbie brrbie rrbbie rrbbie brrbie rbrbie rbrbie brrbie rrbbie rrbbie brrbie rbrbie bbrrie bbrrie brbrie rbbrie brbrie rbbrie ibbrre bibrre ibbrre bibrre bbirre bbirre ibrbre birbre irbbre ribbre bribre rbibre ibrbre birbre irbbre ribbre bribre rbibre bbrire bbrire brbire rbbire brbire rbbire riberb irberb rbierb brierb ibrerb birerb riebrb irebrb reibrb eribrb ierbrb eirbrb rbeirb breirb rebirb erbirb berirb ebrirb iberrb bierrb iebrrb eibrrb beirrb ebirrb ribreb irbreb rbireb brireb ibrreb birreb rirbeb irrbeb rribeb rribeb irrbeb rirbeb rbrieb brrieb rrbieb rrbieb brrieb rbrieb ibrreb birreb irbreb ribreb brireb rbireb rierbb irerbb reirbb erirbb ierrbb eirrbb rirebb irrebb rriebb rriebb irrebb rirebb reribb erribb rreibb rreibb erribb reribb ierrbb eirrbb irerbb rierbb erirbb reirbb rberib brerib rebrib erbrib berrib ebrrib rbreib brreib rrbeib rrbeib brreib rbreib rerbib errbib rrebib rrebib errbib rerbib berrib ebrrib brerib rberib erbrib rebrib iberrb bierrb iebrrb eibrrb beirrb ebirrb ibrerb birerb irberb riberb brierb rbierb ierbrb eirbrb irebrb riebrb eribrb reibrb berirb ebrirb breirb rbeirb erbirb rebirb riberb irberb rbierb brierb ibrerb birerb riebrb irebrb reibrb eribrb ierbrb eirbrb rbeirb breirb rebirb erbirb berirb ebrirb iberrb bierrb iebrrb eibrrb beirrb ebirrb ribreb irbreb rbireb brireb ibrreb birreb rirbeb irrbeb rribeb rribeb irrbeb rirbeb rbrieb brrieb rrbieb rrbieb brrieb rbrieb ibrreb birreb irbreb ribreb brireb rbireb rierbb irerbb reirbb erirbb ierrbb eirrbb rirebb irrebb rriebb rriebb irrebb rirebb reribb erribb rreibb rreibb erribb reribb ierrbb eirrbb irerbb rierbb erirbb reirbb rberib brerib rebrib erbrib berrib ebrrib rbreib brreib rrbeib rrbeib brreib rbreib rerbib errbib rrebib rrebib errbib rerbib berrib ebrrib brerib rberib erbrib rebrib iberrb bierrb iebrrb eibrrb beirrb ebirrb ibrerb birerb irberb riberb brierb rbierb ierbrb eirbrb irebrb riebrb eribrb reibrb berirb ebrirb breirb rbeirb erbirb rebirb rbberi brberi rbberi brberi bbreri bbreri rbebri brebri rebbri erbbri berbri ebrbri rbebri brebri rebbri erbbri berbri ebrbri bberri bberri bebrri ebbrri bebrri ebbrri rbbrei brbrei rbbrei brbrei bbrrei bbrrei rbrbei brrbei rrbbei rrbbei brrbei rbrbei rbrbei brrbei rrbbei rrbbei brrbei rbrbei bbrrei bbrrei brbrei rbbrei brbrei rbbrei rberbi brerbi rebrbi erbrbi berrbi ebrrbi rbrebi brrebi rrbebi rrbebi brrebi rbrebi rerbbi errbbi rrebbi rrebbi errbbi rerbbi berrbi ebrrbi brerbi rberbi erbrbi rebrbi rberbi brerbi rebrbi erbrbi berrbi ebrrbi rbrebi brrebi rrbebi rrbebi brrebi rbrebi rerbbi errbbi rrebbi rrebbi errbbi rerbbi berrbi ebrrbi brerbi rberbi erbrbi rebrbi bberri bberri bebrri ebbrri bebrri ebbrri bbreri bbreri brberi rbberi brberi rbberi berbri ebrbri brebri rbebri erbbri rebbri berbri ebrbri brebri rbebri erbbri rebbri ibberr biberr ibberr biberr bbierr bbierr ibebrr biebrr iebbrr eibbrr beibrr ebibrr ibebrr biebrr iebbrr eibbrr beibrr ebibrr bbeirr bbeirr bebirr ebbirr bebirr ebbirr ibbrer bibrer ibbrer bibrer bbirer bbirer ibrber birber irbber ribber briber rbiber ibrber birber irbber ribber briber rbiber bbrier bbrier brbier rbbier brbier rbbier iberbr bierbr iebrbr eibrbr beirbr ebirbr ibrebr birebr irbebr ribebr briebr rbiebr ierbbr eirbbr irebbr riebbr eribbr reibbr beribr ebribr breibr rbeibr erbibr rebibr iberbr bierbr iebrbr eibrbr beirbr ebirbr ibrebr birebr irbebr ribebr briebr rbiebr ierbbr eirbbr irebbr riebbr eribbr reibbr beribr ebribr breibr rbeibr erbibr rebibr bberir bberir bebrir ebbrir bebrir ebbrir bbreir bbreir brbeir rbbeir brbeir rbbeir berbir ebrbir brebir rbebir erbbir rebbir berbir ebrbir brebir rbebir erbbir rebbir
Note: these 'words' (valid or invalid) are all the permutations of the word ribber. These words are obtained by scrambling the letters in ribber.