-er b-u bbb bbc bbe bbg bbk bbr bbu bcb bcc bce bcg bck bcr bcu be- beb bec bee beg bek ber beu bgb bgc bge bgg bgk bgr bgu bkb bkc bke bkg bkk bkr brb bre brg brk brr bru bub buc bue bug buk bur buu c-- cbb cbc cbe cbg cbk cbr cbu ccb ccc cce ccg cck ccr ccu ce- ceb cec cee ceg cek cer ceu cgb cgc cge cgg cgr cgu ckb ckc crb crc cre crg crk crr cru cub cuc cue cug cuk cur cuu ebb ebc ebe ebg ebk ebr ebu ec- ecb ecc ece ecg eck ecr ecu eeb eec eee eeg eek eer egb egc ege egg egr egu ekb ekc eke ekg ekr eku erb erc ere erg erk err eru eu- eub euc eue eug eur gbc gbe gbg gbk gbr gbu gcb gcc gce gcg gck gcr gcu ge- geb gec gee geg gek ger geu ggb ggc ggg ggr ggu gkb grb grc gre grg grk grr gru gu- gub guc gue gug guk gur guu kbb kbc kbe kbk kbr kbu kcb kcc kce kcg kck kcr kcu ke- keb kec kee keg kek ker kgb kgc kgu kkb kkc kke kkk kkr kku krc krg krk krr kru kub kuc kue kug kuk kur kuu rbb rbc rbe rbg rbk rbr rbu rcb rcc rce rcg rcr rcu re- reb rec ree reg rek rer reu rgb rgc rge rgg rgk rgr rkb rkc rke rkg rkk rku rrb rrc rrg rrk rrr rru rub ruc rue rug ruk rur ruu ubb ubc ube ubg ubk ubr ubu ucb ucc uce ucg uck ucr ucu ueb uec uee ueg uer ugb ugc uge ugg ugk ugr ugu ukb ukc uke ukk ukr uku ur- urb urc ure urg urk urr uru uuc uue uug uur uuu

bbbb bbeb bbrc bbrg bcbc bcbg bccc bcec bcer bcru bcuc bebb bebe beck becu beeb beeg beek beer begg begu beke berc bere berg berk berr beru beuk beur brcb brce breb brec bree breg brek brer brkb brrr bruc brue brug bubb bube bubu bucc buce buck bucu buer bueu buge bugg buke bukk buku bur- burb bure burg burk burr buru cbbc cbcc cbce cbcr cbcu cbec cbee cber cbgb cbkg cbkr cbre ccbc cccb cccc cccu ccee ccgc ccrc ccre ccrg ccuc cebu cec- cece ceeb ceec cege ceke cer- cerc cere cgcc cgcg cger ckbc ckbe ckck cker ckrc crbc crbu crcc crce crcr cre- creb crec cree creg creu crkc crub crue crug cruk cub- cubb cube cucc cuce cuck cuek cuer cuk- cuke curb cure curr ebbc ebbr ebcc eber ebru ebur ecbc ecbe eccb eccc ecce ecrc ecrr ecru eeee eeke eerc eerg egbe egbu egcc egcg egcr egec egee eger eggb egge egre ekeb ekek eker ekur erbb erbe ercc erce ereb erec erer erg- ergg erke errc erre erub eruc erur eubc euer euge eur- eurc eure gc-c gcbc gccc gcrg gebe gece geck geek geer gege gegg gerb gere geru geue gggg grbr grcc grce greb grec gree greg greu grrr grub grue grug grur gubb gubu guck guer gugb guge gugg gugu gurb gure gurg gurk gurr guru kbbb kbbc kbbe kbbg kbbk kbbr kbbu kbcb kbce kbck kbcr kbcu kbeb kbec kbee kbek kber kbgb kbge kbgg kbgr kbkb kbkg kbkk kbkr kbrb kbrc kbre kbrg kbrk kbru kbub kbuc kbue kbuk kbur kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kceb kcec kcee kceg kceu kcgc kcgr kckc kckk kckr kcrc kcrg kcrr kcru kcub kcue kcuk kebb kebc kebe kebr kebu kecg keck kecr keek keer kege kegg kegk kegr kekb kekc keke keku ker- kerb kerc kere kerk kerr keru keug keur kgbb kgbc kgbr kgcb kgcc kgce kgcr kgeb kgec kggg kggr kgrb kgrc kgre kgrg kgrk kgrr kkbb kkbe kkbg kkbr kkcb kkck kkcr kkeg kkgb kkgr kkkk kkrb kkrc kkre kkrk kkrr kkuu krbb krbe krbg krbk krbr krcb krcc krce krcg krcu kreb krec kree krek kreu krkc krke krkk krkr krku krrb krrc krre krrg krrk krrr kruc krue krug kruk krur kubb kubc kube kubr kubu kucb kucc kuce kucr kuek kueu kugb kuge kugr kuke kukk kuku kurb kure kurk kurr kuru kuub kuuk kuur kuuu rbbb rbbr rcbc rccb rccc rcgc rcrg rebb rebe rebk rebu recc rece reck recr recu reeb reek rege regr regu reke rere rerg reru reue reuk reuu rgbe rrrr rubb rube rubu ruce ruck ruer ruge rugg ruke rukk ruku rurc rure ruru ubbe ubek uber ucbc ucrc ugcc ugcg ugur uguu ukcc ukek ukeu ukrc ukur urbe ure- urge urgu urke urre uruk urur uuuu

b-r-k bbbee be-er bebek beber becke becue beebe beeke begee begge begue begur beker bekke berbe berck bercu berec bereg berek berge berk- berke berre berru beuer beure brebu brece breck breek breer breg- brege bregg breke brere breu- brrrr bruce bruck bruer bruge brugg bruke bubbe buber bucek bucku bucur buger bugge bugre buker bukk- burck burcu burek burge burgk burgu burke burru buruc buruk ccccc cebec ceber ceere cegge cerbu cerc- cerce cerec cerer cerge cerke cerre crebe crece creek creer cregg creke creu- creue cruce cruck cruke crure cubbe cubeb cuber cubub cucuk cuker curce curer curre curug ebber eberg ebure ecker eecke eeeee egger egrek ekker ekuku ekuru erbbe erber erceg erege erere erkec eruke eucre eurre gbeke gberg gberu geber gebke gebre gebur geere gegge gerbe gerce gerke gerre grebe grece grecu greek greer grege gregg grgur grrrr grubb grube grure gubbe guber gubru guce gucer guere gurge gurke gurre gurur k-gee kebbe kebek keber kecer keere kekec kerek kergu kerre kreek kreke kreuk kruge kubek kuber kucer kucuk kugur kukec kukur kurbu kurek kurku kurre kuruc kuruk rebbe rebec rebeg reber recce recke recue recur reece reege reere regec reger regge regur rekke rere- reree reuer rubee ruber rubke rucer ruegg