-er b-u bbb bbc bbe bbk bbn bbr bbu bcb bcc bce bck bcn bcr bcu be- beb bec bee bek ben ber beu bkb bkc bke bkk bkn bkr bnb bnc bne bnk bnn bnr bnu brb bre brk brn brr bru bub buc bue buk bun bur buu c-- cbb cbc cbe cbk cbn cbr cbu ccb ccc cce cck ccn ccr ccu ce- ceb cec cee cek cen cer ceu ckb ckc cn- cnb cnc cne cnn cnr cnu crb crc cre crk crn crr cru cub cuc cue cuk cun cur cuu ebb ebc ebe ebk ebn ebr ebu ec- ecb ecc ece eck ecn ecr ecu eeb eec eee eek een eer ekb ekc eke ekr eku en- enb enc ene enk enn enr enu erb erc ere erk ern err eru eu- eub euc eue eun eur kbb kbc kbe kbk kbn kbr kbu kcb kcc kce kck kcn kcr kcu ke- keb kec kee kek ken ker kkb kkc kke kkk kkn kkr kku kn- knc kne knk knn knr knu krc krk krn krr kru kub kuc kue kuk kun kur kuu nbb nbc nbe nbk nbn nbr nbu ncb ncc nce nck ncn ncr ncu ne- neb nec nee nek nen ner neu nkc nke nkk nkn nkr nku nnb nnc nne nnk nnn nnu nrb nrc nre nrk nrn nrr nru nub nuc nue nuk nun nur nuu rbb rbc rbe rbk rbn rbr rbu rcb rcc rce rcn rcr rcu re- reb rec ree rek ren rer reu rkb rkc rke rkk rku rnb rnc rnn rnr rnu rrb rrc rrk rrn rrr rru rub ruc rue ruk run rur ruu ubb ubc ube ubk ubn ubr ubu ucb ucc uce uck ucn ucr ucu ueb uec uee uen uer ukb ukc uke ukk ukn ukr uku un- unb unc une unk unn unr unu ur- urb urc ure urk urn urr uru uuc uue uun uur uuu

-ene bbbb bbeb bbrc bcbc bccc bcec bcer bcnu bcru bcuc bebb bebe beck becu beeb beek been beer beke bene benk benn benu berc bere berk bern berr beru beuk beur bner bnrr brcb brce breb brec bree brek bren brer brkb brrr bruc brue brun bubb bube bubu bucc buce buck bucu buen buer bueu buke bukk buku bunb bune bunk bunn bunu bur- burb bure burk burn burr buru cbbc cbcc cbce cbcn cbcr cbcu cbec cbee cber cbkn cbkr cbre cbrn ccbc ccbn cccb cccc cccu ccee ccnb ccnc ccne ccnr ccnu ccrc ccre ccuc cebu cec- cece ceeb ceec ceke cen- cene cer- cerc cere cern ckbc ckbe ckck cken cker cknb cknc ckrc cnbc cnrc cnrr crbc crbu crcc crce crcr cre- creb crec cree cren creu crkc crne crub crue cruk crun cub- cubb cube cucc cuce cuck cucn cuek cuer cuk- cuke cune curb cure curn curr ebbc ebbr ebcc eben eber ebru ebur ecbc ecbe eccb eccc ecce ecne ecrc ecrr ecru eeee eeke eerc ekeb ekek eken eker ekne ekur enb- enbn enbr ence enee ener enke enkr ennc enne ennu enue enur erbb erbe ercc erce ereb erec eren erer erke erne errc erre erub eruc erur eubc euer eur- eurc eure kbbb kbbc kbbe kbbk kbbr kbbu kbcb kbce kbck kbcr kbcu kbeb kbec kbee kbek kben kber kbkb kbkk kbkr kbnn kbnr kbnu kbrb kbrc kbre kbrk kbrn kbru kbub kbuc kbue kbuk kbun kbur kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kceb kcec kcee kceu kckc kckk kckn kckr kcnb kcnr kcrc kcrn kcrr kcru kcub kcue kcuk kebb kebc kebe kebn kebr kebu keck kecr keek keen keer kekb kekc keke keku ken- kene kenk kenn kenr kenu ker- kerb kerc kere kerk kern kerr keru keun keur kkbb kkbe kkbn kkbr kkcb kkck kkcn kkcr kken kkkk kknb kkne kknn kknu kkrb kkrc kkre kkrk kkrn kkrr kkuu knbb knbc knbe knbn knbr knbu kncb knce knck kncn kncr kncu kneb knec knee knek knen kneu knkk knnb knnk knnr knrb knrk knub knue knuk knur krbb krbe krbk krbr krcb krcc krce krcn krcu kreb krec kree krek kren kreu krkc krke krkk krkn krkr krku krnb krne krnk krnn krnu krrb krrc krre krrk krrn krrr kruc krue kruk krun krur kubb kubc kube kubr kubu kucb kucc kuce kucr kuek kuen kueu kuke kukk kukn kuku kunc kune kunk kunr kunu kurb kure kurk kurr kuru kuub kuuk kuur kuuu nbbc nbcc nber ncbc nccc nccn nccr nccu ncec ncee ncen ncer ncnc ncrc ncre ncue ncuk nebb nebe nebn nebr nebu necc nece neck necr neeb neen neer neke neku nene nenu nerc nere nerk nerr neru neuc neue neuk neun neur neuu nnnn nren nrrc nubc nube nubk nuce nuck nucu nuee nuer nuke nuku nunc nune nunk nunn nurc nure nurn nurr nuru nuuk rbbb rbbr rcbc rccb rccc rcnr rebb rebe rebk rebu recc rece reck recr recu reeb reek reen reke rene renk renn renu rere reru reue reuk reuu rnbr rrrr rrun rubb rube rubu ruce ruck ruen ruer ruke rukk rukn ruku runc rune runk runn rurc rure ruru ruun ubbe ubek uber ucbc ucrc ukcc ukek ukeu uknc ukrc ukur unbe uncc unce uneb unec unee unen uner unke unkn unne urbe ure- urke urne urre uruk urun urur uuen uuuu

b-r-k bbbee be-er bebek beber becke becue beebe beeke beene beken beker bekke bence bene- benke benne bennu benue benuk benun benur berbe berck bercu berec berek beren berk- berke berne berre berru berun beuer beure brebu brece breck breek breen breer breke brene brenk brenn brere breu- brrrr bruce bruck bruen bruer bruke brune brunk brunn bruun bubbe buben buber bucek bucku bucur buker bukk- buknu bunce bunke bunne bunuk bunun burck burcu burek buren burke burn- burne burru buruc buruk burun ccccc cebec ceber cecun ceene ceere cence ceneu cerbu cerc- cerce cerec ceren cerer cerke cerne cerre