bbbb bbbs bbeb bbet bbrc bcbc bcbs bccc bccs bcec bcer bces bcet bcrs bcru bcsc bcss bctc bcts bcuc bebb bebe becs becu beeb beer bees beet berc bere berr bers bert beru bes- bese bess best betc bete bets bett betu beur brcb brce breb brec bree brer bres bret brrr brrs brsb brsr brst brtc bruc brue brus brut bscs bseb bsec bsee bser bses bset bssc bsse bsts btcc btcs btec btrc btrt btss bttb btus bubb bube bubs bubu bucc buce bucs bucu buer bueu bur- burb bure burr burs burt buru busc buse buss bust busu but- bute buts butt buus cbbc cbbs cbcc cbce cbcr cbcs cbct cbcu cbec cbee cber cbet cbre cbrt cbsc cbse cbtc cbus ccbc cccb cccc cccs cccu ccee ccrc ccre ccrs ccrt ccss ccst cctb cctc cctt ccuc ccus ccut cebs cebu cec- cece cecs cect ceeb ceec cees cer- cerc cere cers cert cesc cese cesr cess cest cet- cete cets crbc crbu crcc crce crcr cre- creb crec cree cres cret creu crrt crss crst crtc crts crub crue crus crut cscb cscc csce cscr cscs csec csee cser cset csrc csrs csse cssr cstc cstr csts csur csus ctbs ctec ctrc ctrs ctsc ctss ctsu ctts cub- cubb cube cubs cucc cuce cuer cues curb cure curr curs curt cusb cuss cust cusu cut- cutc cute cuts cutt ebbc ebbr ebbs ebcc eber ebes ebru ebur ebus ecbc ecbe eccb eccc ecce ecct eces ecrc ecrr ecru ecsc ecse ecss ecsu ect- ectc ects ecus eecs eeee eees eerc eers eese eetc eete eets eetu erbb erbe ercc erce ereb erec erer eres eret errc erre errs erse erst erts ertu erub eruc erur erus esbs escb esce escr escs escu esee eser eses eset esse esst essu estc este estr ests esus etbc etbr etcc etcs etec etee eter etes etre etsu ette ettu eubc euer eur- eurc eure eurt euse rbbb rbbr rbbs rbss rbst rcbc rccb rccc rccs rcet rcsc rcss rctc rcts rebb rebe rebs rebu recc rece recr recs rect recu reeb rees reet rere rers rert reru rese ress rest rete retr rets rett reue reus reut reuu rrrr rscc rscs rsee rsre rsts rstu rtcc rtce rtee rtes rtss rtts rubb rube rubs rubu ruce ruct ruer rues ruet rurc rure rurs ruru ruse russ rust rusu rute ruts rutt rutu sbbs sbcc sbcs sbct sber sbse sbst sbtc sbus sccc scce sccs scct scec scee scer scet scr- scrc scre scrs scsc scsr scst scsu sctc sctr scts scub scur scut se-c se-e se-s se-t se-u sebe sebs sebt sec- secc sece secr secs sect secu seeb seec seer sees seet seeu serb serc sere serr sers sert seru sesc sese sess sest set- setc sete sets sett seur srbc srcc srct sreb srec sres srtr srub ssbr sscc ssce sscs ssec ssee sses sset ssrc ssrs sssb sssc ssss sstb sstc ssts stbc stbs stcc stcs stcu stec stee ster stes stet strc stre strs stru stss sttc sttr stub stuc stue stur stus stut sub- subb subs suc- succ sucr sucs suee suer sues suet sueu sur- surc sure surr surs surt suru sus- suse suss sust susu sute sutu suus tbbs tbcb tbcc tbce tbrb tbst tcbs tccc tccu tctc tcts tebu tecr tecs tect teec teer tees teet ter- terc tere terr ters teru tesc tese tess test tete tetr tets tett tetu teut trcc tre- trec tree tres tret treu trst trtc trte trtr trub truc true trus trut truu tsbc tscc tsec tses tset tsse tssr tsst tstc tsts ttbb tter ttss tttt tubb tube tubr tubs tubu tucc tuer tues tuet turb turc ture turr turs turt turu tusc tuss tust tute tuts tutt tutu ubbe uber ubet ucbc uces ucrc ucsb ucsc ucst ucsu ucut uers uess urbe urbs ure- ures uret urre urse urss ursu urte urts urur urus urut usbc usbe usbr usbs uscc usce uscs usee user uses uset ussb ussc usse ussr usss usst ussu ustb ustc uste usts usus utec uter utes utsc uttu uuuu