bbbb bbci bbeb bbpr bbrc bcbc bcbp bccc bcci bcec bcer bcie bcpp bebb bebe bebi beci beeb beep beer beic beir berc bere beri berr bibb bibe bibi bicc bice bici bieb bier bipp birb bire biri birr bpcp bprc brcb brce breb brec bree brei brep brer bric brie brrr cbbc cbcc cbce cbcp cbcr cbec cbee cber cbir cbpc cbpp cbre ccbc cccb cccc ccci cccp ccee ccic ccii ccip ccir ccpe ccpp ccpr ccrc ccre ccri ccrp cebp cec- cece ceci cecp ceeb ceec ceip cepc cepe cepp cepr cer- cerc cere ceri cerp cibc cibe cibi cicc cici cicr ciee cier ciii cipp cirb circ cire ciri cirr cpbc cpce cpeb cpep cper cpic cpre cpri crbc crcc crce crcr cre- creb crec cree crei crep crib cric crie crip crpc ebbc ebbr ebcc eber ebic ecbc ecbe eccb eccc ecce ecci ecib ecip ecpp ecrc ecri ecrr eeee eerc eiec eiei eier eipr eire epcc epci epec epee eper epi- epic epie epip eppc eppp eprb eprp erbb erbe ercc erce ercp ereb erec erei erer eric erie erpe errc erre i-be ibec ibie ibrc ibri icbc icbp iccb iccc icci iccp iccr icec icee icer icpc icrc icre icrr iecc ieie iere ieri iiie iiii iirc ipcc ipce ipec iper ipie ippc ippr ipri irbe irbp ircc iree irer iri- iric irie irip irpc irpe irrc irre irri pbcc pcbc pccc pcce pcep pcer pcip pcpb pcpp pcrc pcre pece peci pecr peec peep peer peip peir pepe pepi per- perc pere peri perp perr pibb pibi picc pice pici picr piep pier piip pipe pipi pipp pirc pire piri pirr ppcc ppci pper ppib ppic ppie pppp pprc prbc prcc prcp pre- preb prec pree prep pri- prie prii prri rbbb rbbr rcbc rccb rccc rcep rcic rcpi rebb rebe recc rece reci recp recr reeb reep reii reir repe repi repp repr rere reri rib- ribe ricc rice riep rier ripe ripi ripp ripr rire riri rpii rrrr