bbbb bbbs bbci bbeb bbrc bcbc bcbs bccc bcci bccs bcec bcer bces bcie bcis bcrs bcsc bcss bebb bebe bebi beci becs beeb beer bees beic beir beis berc bere beri berr bers bes- bese bess bibb bibe bibi bibs bicc bice bici bics bieb bier bies biis birb bire biri birr birs bis- bisc bise biss brcb brce breb brec bree brei brer bres bric brie bris brrr brrs brsb brsr bsci bscs bseb bsec bsee bser bses bsic bssc bsse cbbc cbbs cbcc cbce cbcr cbcs cbec cbee cber cbir cbre cbsc cbse cbsi ccbc cccb cccc ccci cccs ccee ccic ccii ccir ccis ccrc ccre ccri ccrs ccsi ccss cebs cec- cece ceci cecs ceeb ceec cees cer- cerc cere ceri cers cesc cese cesi cesr cess cibc cibe cibi cicc cici cicr cics ciee cier cies ciii ciis cirb circ cire ciri cirr cirs cis- cisc cise cisr ciss crbc crcc crce crcr cre- creb crec cree crei cres crib cric crie cris crss cscb cscc csce csci cscr cscs csec csee cser csib csir csis csrc csrs csse cssr ebbc ebbr ebbs ebcc eber ebes ebic ebis ecbc ecbe eccb eccc ecce ecci eces ecib ecis ecrc ecri ecrr ecsc ecse ecss eecs eeee eees eerc eers eese eesi eics eiec eiei eier eies eire eirs eise eiss erbb erbe ercc erce ereb erec erei erer eres eric erie eris errc erre errs erse ersi esbs escb esce esci escr escs esee eser eses esie esis esri esse essi i-be ibcs ibec ibes ibie ibis ibrc ibri ibss icbc icbs iccb iccc icci iccr iccs icec icee icer ices icis icrc icre icrr icrs icsb icsc icse icsi icsr icss iecc ieie iere ieri iers iesc iesi iesr iies iiie iiii iiis iirc iirs iisc iisi iisr irbe ircc ircs iree irer ires iri- iric irie iris irrc irre irri irrs irse isbe iscc isci iscr iscs iseb isec isee iser ises isic isie isis isri issc isse issi issr isss rbbb rbbr rbbs rbis rbss rcbc rccb rccc rccs rcic rcis rcsc rcsi rcss rebb rebe rebs recc rece reci recr recs reeb rees reii reir reis rere reri rers rese resi ress rib- ribe ribs ricc rice rics rier ries riis rire riri rirs risc rise risi riss rrrr rsbi rscc rscs rsee rsis rsre s-ib s-ic s-ii sbbs sbcc sbcs sber sbic sbse sbsi scbi sccc scce sccs scec scee scer sci- scic scie scir scis scr- scrc scre scri scrs scsc scsi scsr se-c se-e se-i se-s sebe sebi sebs sec- secc sece secr secs seeb seec seer sees seie seii seir seis serb serc sere seri serr sers sesc sese sesi sess sibc sibe sibi sibs sicc sice sici sics siec sier sies sirc sire siri sirr sirs sisc sise sisi siss srbc srcc sreb srec sres srib sris ssbr sscc ssce ssci sscs ssec ssee sses ssis ssrc ssri ssrs sssb sssc sssi ssss