-er b-u bbb bbc bbe bbg bbk bbl bbn bbr bbu bcb bcc bce bcg bck bcl bcn bcr bcu be- beb bec bee beg bek bel ben ber beu bgb bgc bge bgg bgk bgl bgn bgr bgu bkb bkc bke bkg bkk bkl bkn bkr blb blc ble blg blk bll bln blr blu bnb bnc bne bng bnk bnl bnn bnr bnu brb bre brg brk brl brn brr bru bub buc bue bug buk bul bun bur buu c-- cbb cbc cbe cbg cbk cbl cbn cbr cbu ccb ccc cce ccg cck ccl ccn ccr ccu ce- ceb cec cee ceg cek cel cen cer ceu cgb cgc cge cgg cgl cgn cgr cgu ckb ckc cl- clb clc cle clg clk cll cln clr clu cn- cnb cnc cne cng cnl cnn cnr cnu crb crc cre crg crk crl crn crr cru cub cuc cue cug cuk cul cun cur cuu ebb ebc ebe ebg ebk ebl ebn ebr ebu ec- ecb ecc ece ecg eck ecl ecn ecr ecu eeb eec eee eeg eek eel een eer egb egc ege egg egl egn egr egu ekb ekc eke ekg ekl ekr eku elb elc ele elg elk ell eln elr elu en- enb enc ene eng enk enl enn enr enu erb erc ere erg erk erl ern err eru eu- eub euc eue eug eul eun eur gbc gbe gbg gbk gbl gbn gbr gbu gcb gcc gce gcg gck gcl gcn gcr gcu ge- geb gec gee geg gek gel gen ger geu ggb ggc ggg ggn ggr ggu gkb gkn glb glc gle glg glk gll gln glr glu gnb gnc gne gnl gnn gnr gnu grb grc gre grg grk grl grn grr gru gu- gub guc gue gug guk gul gun gur guu kbb kbc kbe kbk kbl kbn kbr kbu kcb kcc kce kcg kck kcl kcn kcr kcu ke- keb kec kee keg kek kel ken ker kgb kgc kgl kgu kkb kkc kke kkk kkl kkn kkr kku kl- klb klc klg klr klu kn- knc kne kng knk knl knn knr knu krc krg krk krl krn krr kru kub kuc kue kug kuk kul kun kur kuu lbb lbc lbe lbg lbk lbl lbr lbu lcb lcc lce lcg lck lcl lcn lcr lcu leb lec lee leg lek lel len ler leu lgb lgc lge lgg lgk lgl lgn lgr lgu lkb lkg lkl lkr llb llc lle llg llk lll lln llr llu lnb lnc lne lng lnk lnl lnn lnr lnu lrb lrc lrg lrk lrn lrr lru lub luc lue lug luk lul lun lur luu nbb nbc nbe nbg nbk nbl nbn nbr nbu ncb ncc nce ncg nck ncl ncn ncr ncu ne- neb nec nee neg nek nel nen ner neu ngb ngc nge ngg ngk ngl ngn ngu nkc nke nkk nkn nkr nku nlb nlc nle nlg nlk nll nln nlr nlu nnb nnc nne nng nnk nnl nnn nnu nrb nrc nre nrg nrk nrl nrn nrr nru nub nuc nue nug nuk nul nun nur nuu rbb rbc rbe rbg rbk rbl rbn rbr rbu rcb rcc rce rcg rcl rcn rcr rcu re- reb rec ree reg rek rel ren rer reu rgb rgc rge rgg rgk rgn rgr rkb rkc rke rkg rkk rku rlc rle rlg rll rln rlr rlu rnb rnc rng rnn rnr rnu rrb rrc rrg rrk rrl rrn rrr rru rub ruc rue rug ruk run rur ruu ubb ubc ube ubg ubk ubl ubn ubr ubu ucb ucc uce ucg uck ucl ucn ucr ucu ueb uec uee ueg uel uen uer ugb ugc uge ugg ugk ugl ugn ugr ugu ukb ukc uke ukk ukl ukn ukr uku ulb ulc ule ulg ulk ull uln ulr ulu un- unb unc une ung unk unl unn unr unu ur- urb urc ure urg urk url urn urr uru uuc uue uug uun uur uuu