-er b-u bbb bbc bbe bbk bbn bbr bbu bcb bcc bce bck bcn bcr bcu bcv be- beb bec bee bek ben ber beu bev bkb bkc bke bkk bkn bkr bkv bnb bnc bne bnk bnn bnr bnu bnv brb bre brk brn brr bru brv bub buc bue buk bun bur buu bvb bvc bve bvk bvn bvr bvu bvv c-- cbb cbc cbe cbk cbn cbr cbu cbv ccb ccc cce cck ccn ccr ccu ccv ce- ceb cec cee cek cen cer ceu cev ckb ckc cn- cnb cnc cne cnn cnr cnu cnv crb crc cre crk crn crr cru crv cub cuc cue cuk cun cur cuu cuv cvb cvc cve cvk cvn cvr cvu cvv ebb ebc ebe ebk ebn ebr ebu ebv ec- ecb ecc ece eck ecn ecr ecu ecv eeb eec eee eek een eer eev ekb ekc eke ekr eku ekv en- enb enc ene enk enn enr enu env erb erc ere erk ern err eru erv eu- eub euc eue eun eur euv evb evc eve evn evr evv kbb kbc kbe kbk kbn kbr kbu kcb kcc kce kck kcn kcr kcu ke- keb kec kee kek ken ker kev kkb kkc kke kkk kkn kkr kku kkv kn- knc kne knk knn knr knu krc krk krn krr kru krv kub kuc kue kuk kun kur kuu kvb kvk kvn kvr kvv nbb nbc nbe nbk nbn nbr nbu nbv ncb ncc nce nck ncn ncr ncu ncv ne- neb nec nee nek nen ner neu nev nkc nke nkk nkn nkr nku nnb nnc nne nnk nnn nnu nnv nrb nrc nre nrk nrn nrr nru nrv nub nuc nue nuk nun nur nuu nuv nvb nvc nve nvk nvn nvu nvv rbb rbc rbe rbk rbn rbr rbu rcb rcc rce rcn rcr rcu rcv re- reb rec ree rek ren rer reu rev rkb rkc rke rkk rku rkv rnb rnc rnn rnr rnu rnv rrb rrc rrk rrn rrr rru rub ruc rue ruk run rur ruu ruv rvb rvc rve rvn rvr rvu rvv ubb ubc ube ubk ubn ubr ubu ubv ucb ucc uce uck ucn ucr ucu ucv ueb uec uee uen uer ukb ukc uke ukk ukn ukr uku un- unb unc une unk unn unr unu unv ur- urb urc ure urk urn urr uru uuc uue uun uur uuu uvb uvc uve uvu uvv v-e vbc vbk vbr vbv vcc vce vcn vcr vcu veb vec vee vek ven ver veu vkb vn- vnr vnu vnv vrb vrc vre vrk vrn vrr vru vue vuk vur vuv vvb vvc vvr vvv

-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 brev brkb brrr bruc brue brun bruv 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 buve cbbc cbcc cbce cbcn cbcr cbcu cbec cbee cber cbkn cbkr cbre cbrn cbvb cbve cbvn cbvr ccbc ccbn cccb cccc cccu cccv ccee ccnb ccnc ccne ccnr ccnu ccrc ccre ccuc cebu cec- cece ceeb ceec ceke cen- cene cer- cerc cere cern ckbc ckbe ckck ckcv 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 cuve cvcc cven cver cvrr ebbc ebbr ebcc eben eber ebru ebur ecbc ecbe eccb eccc ecce ecne ecrc ecrr ecru ecrv eeee eeke eerc eevn ekeb ekek eken eker ekne ekur en-v enb- enbn enbr ence enee ener enke enkr ennc enne ennu enue enur erbb erbe ercc erce ereb erec eren erer erev erke erne errc erre erub eruc erur eruv erve eubc euer eur- eurc eure even ever evre evvk kbbb kbbc kbbe kbbk kbbr kbbu kbcb kbce kbck kbcr kbcu kbeb kbec kbee kbek kben kber kbev kbkb kbkk kbkr kbkv kbnn kbnr kbnu kbnv kbrb kbrc kbre kbrk kbrn kbru kbrv kbub kbuc kbue kbuk kbun kbur kbuu kbvb kbvc kbvr kbvu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kccv kceb kcec kcee kceu kckc kckk kckn kckr kckv kcnb kcnr kcnv kcrc kcrn kcrr kcru kcrv kcub kcue kcuk kcvk kcvr kcvu kcvv 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 kerv keun keur keve kkbb kkbe kkbn kkbr kkcb kkck kkcn kkcr kken kkkk kknb kkne kknn kknu kkrb kkrc kkre kkrk kkrn kkrr kkrv kkuu kkvr kkvu kkvv knbb knbc knbe knbn knbr knbu kncb knce knck kncn kncr kncu kneb knec knee knek knen kneu knev knkk knnb knnk knnr knrb knrk knrv knub knue knuk knur knuv knvn knvr krbb krbe krbk krbr krcb krcc krce krcn krcu kreb krec kree krek kren kreu krev krkc krke krkk krkn krkr krku krkv krnb krne krnk krnn krnu krnv krrb krrc krre krrk krrn krrr kruc krue kruk krun krur krvb krvc krve krvk krvn krvr krvv kubb kubc kube kubr kubu kucb kucc kuce kucr kucv kuek kuen kueu kuke kukk kukn kuku kunc kune kunk kunr kunu kunv kurb kure kurk kurr kuru kurv kuub kuuk kuur kuuu kuvr kvbc kvbr kvcb kvcc kvce kvck kvcr kvcu kvcv kvec kven kver kvnc kvne kvnn kvnr kvnu kvrc kvre kvrr kvrv kvue kvuu kvvn kvvr kvvv 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 neev neke neku nene nenu nerc nere nerk nerr neru nerv