bbbb bbbs bbeb bbrc bcbc bcbs bccc bccs bcec bcer bces bcrs bcru bcsc bcss bcuc bebb bebe becs becu beeb beer bees berc bere berr bers beru bes- bese bess beur brcb brce breb brec bree brer bres brrr brrs brsb brsr bruc brue brus bscs bseb bsec bsee bser bses bssc bsse bubb bube bubs bubu bucc buce bucs bucu buer bueu bur- burb bure burr burs buru busc buse buss busu buus cbbc cbbs cbcc cbce cbcr cbcs cbcu cbec cbee cber cbre cbsc cbse cbus ccbc cccb cccc cccs cccu ccee ccrc ccre ccrs ccss ccuc ccus cebs cebu cec- cece cecs ceeb ceec cees cer- cerc cere cers cesc cese cesr cess crbc crbu crcc crce crcr cre- creb crec cree cres creu crss crub crue crus cscb cscc csce cscr cscs csec csee cser csrc csrs csse cssr csur csus cub- cubb cube cubs cucc cuce cuer cues curb cure curr curs cusb cuss cusu ebbc ebbr ebbs ebcc eber ebes ebru ebur ebus ecbc ecbe eccb eccc ecce eces ecrc ecrr ecru ecsc ecse ecss ecsu ecus eecs eeee eees eerc eers eese erbb erbe ercc erce ereb erec erer eres errc erre errs erse erub eruc erur erus esbs escb esce escr escs escu esee eser eses esse essu esus eubc euer eur- eurc eure euse rbbb rbbr rbbs rbss rcbc rccb rccc rccs rcsc rcss rebb rebe rebs rebu recc rece recr recs recu reeb rees rere rers reru rese ress reue reus reuu rrrr rscc rscs rsee rsre rubb rube rubs rubu ruce ruer rues rurc rure rurs ruru ruse russ rusu sbbs sbcc sbcs sber sbse sbus sccc scce sccs scec scee scer scr- scrc scre scrs scsc scsr scsu scub scur se-c se-e se-s se-u sebe sebs sec- secc sece secr secs secu seeb seec seer sees seeu serb serc sere serr sers seru sesc sese sess seur srbc srcc sreb srec sres srub ssbr sscc ssce sscs ssec ssee sses ssrc ssrs sssb sssc ssss sub- subb subs suc- succ sucr sucs suee suer sues sueu sur- surc sure surr surs suru sus- suse suss susu suus ubbe uber ucbc uces ucrc ucsb ucsc ucsu uers uess urbe urbs ure- ures urre urse urss ursu urur urus usbc usbe usbr usbs uscc usce uscs usee user uses ussb ussc usse ussr usss ussu usus uuuu