-er -th b-u bbb bbc bbe bbg bbh bbr bbt bbu bcb bcc bce bcg bch bcr bct bcu be- beb bec bee beg beh ber bet beu bgb bgc bge bgg bgh bgr bgt bgu bhb bhc bhe bhg bhh bhr bht bhu brb bre brg brh brr brt bru btb btc bte btg bth btr btt btu bub buc bue bug buh bur but buu c-- cbb cbc cbe cbg cbh cbr cbt cbu ccb ccc cce ccg cch ccr cct ccu ce- ceb cec cee ceg ceh cer cet ceu cgb cgc cge cgg cgh cgr cgt cgu ch- chb chc che chg chh chr cht chu crb crc cre crg crh crr crt cru ctb ctc cte ctg cth ctr ctt ctu cub cuc cue cug cuh cur cut cuu ebb ebc ebe ebg ebh ebr ebt ebu ec- ecb ecc ece ecg ech ecr ect ecu eeb eec eee eeg eer eet egb egc ege egg egh egr egt egu ehb ehc ehe ehg ehh ehr eht ehu erb erc ere erg erh err ert eru etb etc ete etg eth etr ett etu eu- eub euc eue eug eur eut gbc gbe gbg gbh gbr gbt gbu gcb gcc gce gcg gch gcr gct gcu ge- geb gec gee geg geh ger get geu ggb ggc ggg ggh ggr ggt ggu ghb ghc ghe ghg ghh ghr ght grb grc gre grg grh grr grt gru gtb gtc gte gtg gth gtr gtt gtu gu- gub guc gue gug gur gut guu hbb hbc hbe hbg hbh hbr hbt hbu hcb hcc hce hcg hch hcr hct he- heb hec hee heg heh her het heu hgb hgc hge hgg hgh hgr hgt hgu hhb hhc hhe hhg hhh hhr hht hhu hr- hrb hrc hre hrg hrh hrr hrt hru htb htc hte htg hth htr htt hub huc hue hug huh hur hut huu rbb rbc rbe rbg rbh rbr rbt rbu rcb rcc rce rcg rch rcr rct rcu re- reb rec ree reg reh rer ret reu rgb rgc rge rgg rgh rgr rgt rh- rhb rhc rhe rhg rhh rhr rht rhu rrb rrc rrg rrh rrr rrt rru rtb rtc rte rtg rtr rtt rtu rub ruc rue rug ruh rur rut ruu tbb tbc tbe tbg tbh tbr tbt tbu tcb tcc tce tcg tch tcr tct tcu te- teb tec tee teg teh ter tet teu tgb tgc tge tgg tgh tgr tgt tgu th- thb thc the thg thh thr tht thu trb trc tre trg trh trr trt tru ttb ttc tte ttg tth ttr ttt ttu tub tuc tue tug tuh tur tut tuu ubb ubc ube ubg ubh ubr ubt ubu ucb ucc uce ucg uch ucr uct ucu ueb uec uee ueg ueh uer uet ugb ugc uge ugg ugh ugr ugt ugu uhb uhc uhe uhh uhr uht uhu ur- urb urc ure urg urr urt uru utb utc ute uth utr utt utu uuc uue uug uur uut uuu