-er b-u bbb bbc bbe bbg bbk bbn bbr bbu bcb bcc bce bcg bck bcn bcr bcu be- beb bec bee beg bek ben ber beu bgb bgc bge bgg bgk bgn bgr bgu bkb bkc bke bkg bkk bkn bkr bnb bnc bne bng bnk bnn bnr bnu brb bre brg brk brn brr bru bub buc bue bug buk bun bur buu c-- cbb cbc cbe cbg cbk cbn cbr cbu ccb ccc cce ccg cck ccn ccr ccu ce- ceb cec cee ceg cek cen cer ceu cgb cgc cge cgg cgn cgr cgu ckb ckc cn- cnb cnc cne cng cnn cnr cnu crb crc cre crg crk crn crr cru cub cuc cue cug cuk cun cur cuu ebb ebc ebe ebg ebk ebn ebr ebu ec- ecb ecc ece ecg eck ecn ecr ecu eeb eec eee eeg eek een eer egb egc ege egg egn egr egu ekb ekc eke ekg ekr eku en- enb enc ene eng enk enn enr enu erb erc ere erg erk ern err eru eu- eub euc eue eug eun eur gbc gbe gbg gbk gbn gbr gbu gcb gcc gce gcg gck gcn gcr gcu ge- geb gec gee geg gek gen ger geu ggb ggc ggg ggn ggr ggu gkb gkn gnb gnc gne gnn gnr gnu grb grc gre grg grk grn grr gru gu- gub guc gue gug guk gun gur guu kbb kbc kbe kbk kbn kbr kbu kcb kcc kce kcg kck kcn kcr kcu ke- keb kec kee keg kek ken ker kgb kgc kgu kkb kkc kke kkk kkn kkr kku kn- knc kne kng knk knn knr knu krc krg krk krn krr kru kub kuc kue kug kuk kun kur kuu nbb nbc nbe nbg nbk nbn nbr nbu ncb ncc nce ncg nck ncn ncr ncu ne- neb nec nee neg nek nen ner neu ngb ngc nge ngg ngk ngn ngu nkc nke nkk nkn nkr nku nnb nnc nne nng nnk nnn nnu nrb nrc nre nrg nrk nrn nrr nru nub nuc nue nug nuk nun nur nuu rbb rbc rbe rbg rbk rbn rbr rbu rcb rcc rce rcg rcn rcr rcu re- reb rec ree reg rek ren rer reu rgb rgc rge rgg rgk rgn rgr rkb rkc rke rkg rkk rku rnb rnc rng rnn rnr rnu rrb rrc rrg rrk rrn rrr rru rub ruc rue rug ruk run rur ruu ubb ubc ube ubg ubk ubn ubr ubu ucb ucc uce ucg uck ucn ucr ucu ueb uec uee ueg uen uer ugb ugc uge ugg ugk ugn ugr ugu ukb ukc uke ukk ukn ukr uku un- unb unc une ung unk unn unr unu ur- urb urc ure urg urk urn urr uru uuc uue uug uun uur uuu

-ene bbbb bbeb bbng bbrc bbrg bcbc bcbg bccc bcec bcer bcnu bcru bcuc bebb bebe beck becu beeb beeg beek been beer begg begu beke bene beng benk benn benu berc bere berg berk bern berr beru beuk beur bgun bneg bner bnrr brcb brce breb brec bree breg brek bren brer brkb brrr bruc brue brug brun bubb bube bubu bucc buce buck bucu buen buer bueu buge bugg buke bukk buku bunb bune bung bunk bunn bunu bur- burb bure burg burk burn burr buru cbbc cbcc cbce cbcn cbcr cbcu cbec cbee cber cbgb cbkg cbkn cbkr cbre cbrn ccbc ccbn cccb cccc cccu ccee ccgc ccnb ccnc ccne ccnr ccnu ccrc ccre ccrg ccuc cebu cec- cece ceeb ceec cege ceke cen- cene ceng cer- cerc cere cern cgcc cgcg cger ckbc ckbe ckck cken cker ckgn cknb cknc ckrc cnbc cnrc cnrr crbc crbu crcc crce crcr cre- creb crec cree creg cren creu crkc crne crub crue crug 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 eeng eerc eerg egbe egbu egcc egcg egcr egec egee eger eggb egge egne egre ekeb ekek eken eker ekne ekur enb- enbn enbr ence enee eneg ener enge engg engr enke enkr ennc enne ennu enue enur erbb erbe ercc erce ereb erec eren erer erg- ergg erke erne errc erre erub eruc erur eubc euer euge eur- eurc eure gc-c gcbc gccc gcrg gebe gece geck geek geen geer gege gegg gen- genc gene geng genk genn genu gerb gere gern geru geue geun gggg ggrn gncc gneu gngc gnrc gnrr grbr grcc grce greb grec gree greg gren greu grrr grub grue grug grun grur gubb gubu guck guen guer gugb guge gugg gugu gung gunk gunn gurb gure gurg gurk gurn gurr guru kbbb kbbc kbbe kbbg kbbk kbbr kbbu kbcb kbce kbck kbcr kbcu kbeb kbec kbee kbek kben kber kbgb kbge kbgg kbgn kbgr kbkb kbkg kbkk kbkr kbng kbnn kbnr kbnu kbrb kbrc kbre kbrg kbrk kbrn kbru kbub kbuc kbue kbuk kbun kbur kbuu kcbc kcbk kcbr kcbu kccb kccc kcck kccr kccu kceb kcec kcee kceg kceu kcgc kcgr kckc kckk kckn kckr kcnb kcnr kcrc kcrg kcrn kcrr kcru kcub kcue kcuk kebb kebc kebe kebn kebr kebu kecg keck kecr keek keen keer kege kegg kegk kegr kekb kekc keke keku ken- kene keng kenk kenn kenr kenu ker- kerb kerc kere kerk kern kerr keru keug keun keur kgbb kgbc kgbn kgbr kgcb kgcc kgce kgcn kgcr kgeb kgec kgen kggg kggr kgnb kgnc kgng kgnr kgnu kgrb kgrc kgre kgrg kgrk kgrn kgrr kkbb kkbe kkbg kkbn kkbr kkcb kkck kkcn kkcr kkeg kken kkgb kkgr 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 kngn kngr knkk knnb knng knnk knnr knrb knrg knrk knub knue knuk knur krbb