-er -ic b-u bbb bbc bbe bbg bbi bbr bbt bbu bcb bcc bce bcg bci bcr bct bcu be- beb bec bee beg bei ber bet beu bgb bgc bge bgg bgi bgr bgt bgu bi- bib bic bie big bii bir bit biu brb bre brg bri brr brt bru btb btc bte btg bti btr btt btu bub buc bue bug bui bur but buu c-- cbb cbc cbe cbg cbi cbr cbt cbu ccb ccc cce ccg cci ccr cct ccu ce- ceb cec cee ceg cei cer cet ceu cgb cgc cge cgg cgi cgr cgt cgu ci- cib cic cie cig cii cir cit ciu crb crc cre crg cri crr crt cru ctb ctc cte ctg cti ctr ctt ctu cub cuc cue cug cui cur cut cuu ebb ebc ebe ebg ebi ebr ebt ebu ec- ecb ecc ece ecg eci ecr ect ecu eeb eec eee eeg eer eet egb egc ege egg egi egr egt egu eib eic eie eig eii eir eit eiu erb erc ere erg eri err ert eru etb etc ete etg eti etr ett etu eu- eub euc eue eug eui eur eut gbc gbe gbg gbi gbr gbt gbu gcb gcc gce gcg gci gcr gct gcu ge- geb gec gee geg gei ger get geu ggb ggc ggg ggi ggr ggt ggu gib gic gie gig gii gir git giu grb grc gre grg gri grr grt gru gtb gtc gte gtg gti gtr gtt gtu gu- gub guc gue gug gui gur gut guu ibb ibc ibe ibg ibi ibr ibt ibu icb icc ice icg ici icr ict icu ie- iec iee ieg iei ier iet igb igc ige igg igi igr igt igu iib iic iie iii iir iit iiu ir- irb irc ire irg iri irr irt iru itb itc ite itg iti itt itu iu- iub iuc iue iug iui iur iut rbb rbc rbe rbg rbi rbr rbt rbu rcb rcc rce rcg rci rcr rct rcu re- reb rec ree reg rei rer ret reu rgb rgc rge rgg rgi rgr rgt rib ric rie rig rii rir rit rrb rrc rrg rri rrr rrt rru rtb rtc rte rtg rti rtr rtt rtu rub ruc rue rug rui rur rut ruu tbb tbc tbe tbg tbi tbr tbt tbu tcb tcc tce tcg tci tcr tct tcu te- teb tec tee teg tei ter tet teu tgb tgc tge tgg tgi tgr tgt tgu tib tic tie tig tii tir tit tiu trb trc tre trg tri trr trt tru ttb ttc tte ttg tti ttr ttt ttu tub tuc tue tug tui tur tut tuu ubb ubc ube ubg ubi ubr ubt ubu ucb ucc uce ucg uci ucr uct ucu ueb uec uee ueg uei uer uet ugb ugc uge ugg ugi ugr ugt ugu uib uic uie uig uii uir uit uiu ur- urb urc ure urg uri urr urt uru utb utc ute uti utr utt utu uuc uue uug uur uut uuu