-er b-u bbb bbc bbe bbr bbs bbu bcb bcc bce bcr bcs bcu be- beb bec bee ber bes beu brb bre brr brs bru bsb bsc bse bsr bss bsu bub buc bue bur bus buu c-- cbb cbc cbe cbr cbs cbu ccb ccc cce ccr ccs ccu ce- ceb cec cee cer ces ceu crb crc cre crr crs cru csb csc cse csr css csu cub cuc cue cur cus cuu ebb ebc ebe ebr ebs ebu ec- ecb ecc ece ecr ecs ecu eeb eec eee eer ees erb erc ere err ers eru es- esb esc ese esr ess esu eu- eub euc eue eur eus rbb rbc rbe rbr rbs rbu rcb rcc rce rcr rcs rcu re- reb rec ree rer res reu rrb rrc rrr rrs rru rsb rsc rse rsr rss rsu rub ruc rue rur rus ruu sbb sbc sbe sbr sbs sbu scb scc sce scr scs scu se- seb sec see ser ses seu sr- srb src sre srr srs ss- ssb ssc sse ssr sss ssu sub suc sue sur sus suu ubb ubc ube ubr ubs ubu ucb ucc uce ucr ucs ucu ueb uec uee uer ues ur- urb urc ure urr urs uru usb usc use usr uss usu uuc uue uur uus uuu

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

bbbee bbser bbsrc bbuss bcers be-er beber bebes becue beebe beebs beers berbe bercu berec beres berre berru berse berus besee besse beuer beure brebu brece breer brees brere brers brese bress breu- brrrr brsec bruce bruer brues bruse bruss bsure bubbe buber buces bucsu bucur burbs burcu bures burrs burru burse buruc burus buser buses busse bussu busur busuu c-bus cbers ccccc cebec ceber cebes cebus ceere ceese cerbu cerc- cerce cercs cerec cerer ceres cerre cerrs cerse cerss cerus cesce cescr cesse crebe crece creer crees cresc crese cress creu- creue crres cruce crure cruse csere cubbe cubeb cuber cubes cubub cuers curbs curce curer cures curre currs curse cusec cuser cusse ebber ebers ebure ecrus ecser eeeee erbbe erber erebs erecs erere erres erses erubs esbus esces esere esser esses essse essue esure eucre eurre eurus euser rebbe rebec reber rebus recce recue recur recus reece reecs reere reese rere- reree reres resee reses resse resue resus reuer reuse reuss rubee ruber rubes rubus rucer ruere ruers rurec rusce ruses russe s-bus sccbc scere screc scree scrub scrue scrus scure scurr scuse sebbe sebes secre secur secus seebe seece seere seers seese seesu serbs serce serec serer seres serre serse serss serue sesce seser seses sesse sesue seuer seure seuss srbce srbec sssrb sssss subbu suber subss sucr- sucre suere suers suess sueur surer sures surre surur surus suser suses susse susus u-cee uber- ubers urbes ursus urubu uruce urucu us-sc usees users usses usure uuuuu

bbbbbb bbsers becure beebee beebes beerse berbee berber berbes berere beresc berrer berres bersee berube besbes besbre besser besses bessus besure beurre brbcsc brebes breere breese breres bresse breuer brubru bruces bruree brusse bubber bubbes bububu bueres burbur burcer burree burrer burser burses burseu bursuc busbee busser busses c-cube ceecee ceesse cercus cereus ceruce ceruse cesser cesses cesure creese cresce cresse cresus creuse cruces cruses csecse cubber cubebs cubers cubube cucube cucurb curber curers currer cursee curser curses cursus cuscus cusecs cusser cusses ebbers eburru ebusus eebree erbree erebus eresus ersure escuse eseebu essess esssse essure eusebe re-use rebbec rebbes rebecs rebeuc recces recess recrue recuer recurb recure recurs recuse reeser reeses rerees rescue resees resues reuere reuser reuses rreuse rubbee rubber rubeus ruccus ruscus russer russes russus screeb screes scrubs