-er b-u bbb bbc bbe bbg bbo bbr bbt bbu bcb bcc bce bcg bco bcr bct bcu be- beb bec bee beg beo ber bet beu bgb bgc bge bgg bgo bgr bgt bgu bob boc boe bog boo bor bot bou brb bre brg bro brr brt bru btb btc bte btg bto btr btt btu bub buc bue bug buo bur but buu c-- cbb cbc cbe cbg cbo cbr cbt cbu ccb ccc cce ccg cco ccr cct ccu ce- ceb cec cee ceg ceo cer cet ceu cgb cgc cge cgg cgo cgr cgt cgu co- cob coc coe cog coo cor cot cou crb crc cre crg cro crr crt cru ctb ctc cte ctg cto ctr ctt ctu cub cuc cue cug cuo cur cut cuu ebb ebc ebe ebg ebo ebr ebt ebu ec- ecb ecc ece ecg eco ecr ect ecu eeb eec eee eeg eeo eer eet egb egc ege egg ego egr egt egu eo- eob eoc eoe eog eoo eor eot eou erb erc ere erg ero err ert eru etb etc ete etg eto etr ett etu eu- eub euc eue eug eur eut gbc gbe gbg gbo gbr gbt gbu gcb gcc gce gcg gco gcr gct gcu ge- geb gec gee geg geo ger get geu ggb ggc ggg ggo ggr ggt ggu gob goc goe gog goo gor got gou grb grc gre grg gro grr grt gru gtb gtc gte gtg gto gtr gtt gtu gu- gub guc gue gug guo gur gut guu ob- obb obc obe obg obo obr obt obu oc- ocb occ ocg oco ocr oct ocu oeb oec oee oeg oeo oer oet ogc oge ogg ogo ogt oo- oob ooc oog ooo oor oot or- orb orc ore org oro orr ort oru ot- otb otc ote otg oto otr ott otu ou- ouc oue ouo our out rbb rbc rbe rbg rbo rbr rbt rbu rcb rcc rce rcg rco rcr rct rcu re- reb rec ree reg reo rer ret reu rgb rgc rge rgg rgo rgr rgt rob roc roe rog roo ror rot rou rrb rrc rrg rrr rrt rru rtb rtc rte rtg rto rtr rtt rtu rub ruc rue rug ruo rur rut ruu tbb tbc tbe tbg tbo tbr tbt tbu tcb tcc tce tcg tco tcr tct tcu te- teb tec tee teg teo ter tet teu tgb tgc tge tgg tgo tgr tgt tgu to- tob toc toe tog too tor tot tou trb trc tre trg tro trr trt tru ttb ttc tte ttg tto ttr ttt ttu tub tuc tue tug tuo tur tut tuu ubb ubc ube ubg ubo ubr ubt ubu ucb ucc uce ucg uco ucr uct ucu ueb uec uee ueg uer uet ugb ugc uge ugg ugo ugr ugt ugu uob uoc uoe uog uoo uor uot ur- urb urc ure urg uro urr urt uru utb utc ute uto utr utt utu uuc uue uug uur uut uuu