-er b-u bbb bbc bbd bbe bbk bbn bbr bbu bcb bcc bcd bce bck bcn bcr bcu bdb bdc bdd bde bdk bdr bdu be- beb bec bed bee bek ben ber beu bkb bkc bke bkk bkn bkr bnb bnc bnd bne bnk bnn bnr bnu brb brd bre brk brn brr bru bub buc bud bue buk bun bur buu c-- cbb cbc cbd cbe cbk cbn cbr cbu ccb ccc ccd cce cck ccn ccr ccu cdb cdc cdd cde cdk cdn cdr cdu ce- ceb cec ced cee cek cen cer ceu ckb ckc ckd cn- cnb cnc cnd cne cnn cnr cnu crb crc crd cre crk crn crr cru cub cuc cud cue cuk cun cur cuu dbb dbc dbd dbe dbk dbn dbr dbu dcb dcc dcd dce dck dcn dcr dcu ddb ddc ddd dde ddk ddn ddr ddu de- deb dec ded dee dek den der deu dkb dkc dke dkk dkr dku dnb dnc dnd dne dnk dnn dnr drb drc drd dre drk drn drr dru dub duc dud due duk dun dur ebb ebc ebd ebe ebk ebn ebr ebu ec- ecb ecc ecd ece eck ecn ecr ecu ed- edb edc edd ede edk edn edr edu eeb eec eed eee eek een eer ekb ekc ekd eke ekr eku en- enb enc end ene enk enn enr enu erb erc erd ere erk ern err eru eu- eub euc eud eue eun eur kbb kbc kbd kbe kbk kbn kbr kbu kcb kcc kcd kce kck kcn kcr kcu kdb kdc kde kdk kdr kdu ke- keb kec ked kee kek ken ker kkb kkc kke kkk kkn kkr kku kn- knc knd kne knk knn knr knu krc krd krk krn krr kru kub kuc kud kue kuk kun kur kuu nbb nbc nbd nbe nbk nbn nbr nbu ncb ncc ncd nce nck ncn ncr ncu ndb ndc ndd nde ndk ndn ndr ndu ne- neb nec ned nee nek nen ner neu nkc nke nkk nkn nkr nku nnb nnc nne nnk nnn nnu nrb nrc nrd nre nrk nrn nrr nru nub nuc nud nue nuk nun nur nuu rbb rbc rbd rbe rbk rbn rbr rbu rcb rcc rcd rce rcn rcr rcu rdb rdc rdd rde rdn rdr rdu re- reb rec red ree rek ren rer reu rkb rkc rke rkk rku rnb rnc rnd rnn rnr rnu rrb rrc rrd rrk rrn rrr rru rub ruc rud rue ruk run rur ruu ubb ubc ube ubk ubn ubr ubu ucb ucc ucd uce uck ucn ucr ucu udb udc udd ude udk udn udr udu ueb uec ued uee uen uer ukb ukc uke ukk ukn ukr uku un- unb unc und une unk unn unr unu ur- urb urc urd ure urk urn urr uru uuc uue uun uur uuu

-ene bbbb bbdd bbeb bbrc bcbc bccc bcde bcec bcer bcnu bcru bcuc bd-r bdbc bddc bebb bebe beck becu bede bedu beeb beed beek been beer beke bend bene benk benn benu berc berd bere berk bern berr beru beuk beur bner bnrr brcb brce breb brec bred bree brek bren brer brkb brrr bruc brud brue brun bubb bube bubu bucc buce buck bucu budb budd bude budu buen buer bueu buke bukk buku bunb bund bune bunk bunn bunu bur- burb burd bure burk burn burr buru c-cd cbbc cbcc cbce cbcn cbcr cbcu cbdb cbdc cbdn cbec cbee cber cbkn cbkr cbnd cbrd cbre cbrn ccbc ccbn cccb cccc cccu ccdc ccdn ccdr cced ccee ccnb ccnc ccne ccnr ccnu ccrc ccre ccuc cd-e cd-r cddb cddr cdec cder cdnb cdnc cdre cebu cec- cece cedd cede cedu ceeb ceec ceke cen- cend cene cer- cerc cerd cere cern ckbc ckbe ckck ckdu cken cker cknb cknc ckrc ckrd cnbc cndd cnrc cnrr crbc crbu crcc crce crcr crdc cre- creb crec cred cree cren creu crkc crne crub crud crue cruk crun cub- cubb cube cucc cuce cuck cucn cude cued cuek cuer cuk- cuke cund cune curb curd cure curn curr dbcc dbrn dcbc dccb dccc dccu dcdb dcrk dddd ddrc ddre ddub debe debu dec- decc decd dece deck dedd dede dedu deeb deed deek deen deer dek- deke dene denk denn denu der- derb derc dere derk dern derr deue deuk deur dkdc dnce dner dnrc dnuk drbc dred dree drek dren drub drue druk druu dub- dubb dubc dube dubu duce duck dudd dude dudu duer duke duku dunc dune dunk dunn dure durk durn duru duur ebbc ebbr ebcc ebed eben eber ebru ebur ecbc ecbe eccb eccc ecce ecdc eced ecne ecrc ecrr ecru eddc edde ede- eden eder edrn edru educ edun edur eede eedu eeee eeke eend eerc ekeb eked ekek eken eker ekne ekur enb- enbn enbr ence end- ende endu ened enee ener enke enkr ennc enne ennu enue enur erbb erbe ercc erce erde ereb erec ered eren erer erke erne errc erre erub eruc erur eubc eucd eude euer eur- eurc eure kbbb kbbc kbbd kbbe kbbk kbbr kbbu kbcb kbce kbck kbcr kbcu kbdb kbde kbdn kbdr kbeb kbec kbed kbee kbek kben kber kbkb kbkk kbkr kbnd kbnn kbnr kbnu kbrb kbrc kbrd kbre kbrk kbrn kbru kbub kbuc kbud kbue kbuk kbun kbur kbuu kcbc kcbd kcbk kcbr kcbu kccb kccc kccd kcck kccr kccu kcdc kcdd kcdr kcdu kceb kcec kced kcee kceu kckc kckk kckn kckr kcnb kcnd kcnr kcrc kcrn kcrr kcru kcub kcue kcuk kdbb kdbn kdbr kdcc kdcd kdce kdcr kddb kddc kddd kddk kddr kdeb kdec kden kdkb kdkd kdkk kdkn kdkr kdnd kdne kdnk kdnn kdnr kdrb kdub kduc kdun kdur kebb kebc kebe kebn kebr kebu keck kecr kedb kedc kedd kede kedr keed keek keen keer kekb kekc keke keku ken- kend kene kenk kenn kenr kenu ker- kerb kerc kere kerk kern kerr keru keun keur