-er b-u bbb bbc bbe bbg bbn bbr bbt bbu bcb bcc bce bcg bcn bcr bct bcu be- beb bec bee beg ben ber bet beu bgb bgc bge bgg bgn bgr bgt bgu bnb bnc bne bng bnn bnr bnt bnu brb bre brg brn brr brt bru btb btc bte btg btn btr btt btu bub buc bue bug bun bur but buu c-- cbb cbc cbe cbg cbn cbr cbt cbu ccb ccc cce ccg ccn ccr cct ccu ce- ceb cec cee ceg cen cer cet ceu cgb cgc cge cgg cgn cgr cgt cgu cn- cnb cnc cne cng cnn cnr cnt cnu crb crc cre crg crn crr crt cru ctb ctc cte ctg ctn ctr ctt ctu cub cuc cue cug cun cur cut cuu ebb ebc ebe ebg ebn ebr ebt ebu ec- ecb ecc ece ecg ecn ecr ect ecu eeb eec eee eeg een eer eet egb egc ege egg egn egr egt egu en- enb enc ene eng enn enr ent enu erb erc ere erg ern err ert eru etb etc ete etg etn etr ett etu eu- eub euc eue eug eun eur eut gbc gbe gbg gbn gbr gbt gbu gcb gcc gce gcg gcn gcr gct gcu ge- geb gec gee geg gen ger get geu ggb ggc ggg ggn ggr ggt ggu gnb gnc gne gnn gnr gnt gnu grb grc gre grg grn grr grt gru gtb gtc gte gtg gtn gtr gtt gtu gu- gub guc gue gug gun gur gut guu nbb nbc nbe nbg nbn nbr nbt nbu ncb ncc nce ncg ncn ncr nct ncu ne- neb nec nee neg nen ner net neu ngb ngc nge ngg ngn ngt ngu nnb nnc nne nng nnn nnt nnu nrb nrc nre nrg nrn nrr nrt nru ntb ntc nte ntg ntn ntr ntt ntu nub nuc nue nug nun nur nut nuu rbb rbc rbe rbg rbn rbr rbt rbu rcb rcc rce rcg rcn rcr rct rcu re- reb rec ree reg ren rer ret reu rgb rgc rge rgg rgn rgr rgt rnb rnc rng rnn rnr rnt rnu rrb rrc rrg rrn rrr rrt rru rtb rtc rte rtg rtn rtr rtt rtu rub ruc rue rug run rur rut ruu tbb tbc tbe tbg tbn tbr tbt tbu tcb tcc tce tcg tcn tcr tct tcu te- teb tec tee teg ten ter tet teu tgb tgc tge tgg tgn tgr tgt tgu tnb tnc tne tng tnn tnr tnt trb trc tre trg trn trr trt tru ttb ttc tte ttg ttn ttr ttt ttu tub tuc tue tug tun tur tut tuu ubb ubc ube ubg ubn ubr ubt ubu ucb ucc uce ucg ucn ucr uct ucu ueb uec uee ueg uen uer uet ugb ugc uge ugg ugn ugr ugt ugu un- unb unc une ung unn unr unt unu ur- urb urc ure urg urn urr urt uru utb utc ute utn utr utt utu uuc uue uug uun uur uut uuu