-er b-u bbb bbc bbe bbm bbr bbt bbu bcb bcc bce bcm bcr bct bcu be- beb bec bee bem ber bet beu bmb bmc bme bmm bmr bmt bmu brb bre brm brr brt bru btb btc bte btm btr btt btu bub buc bue bum bur but buu c-- cbb cbc cbe cbm cbr cbt cbu ccb ccc cce ccm ccr cct ccu ce- ceb cec cee cem cer cet ceu cmb cmc cme cmm cmr cmt cmu crb crc cre crm crr crt cru ctb ctc cte ctm ctr ctt ctu cub cuc cue cum cur cut cuu ebb ebc ebe ebm ebr ebt ebu ec- ecb ecc ece ecm ecr ect ecu eeb eec eee eem eer eet em- emb emc eme emm emr emt emu erb erc ere erm err ert eru etb etc ete etm etr ett etu eu- eub euc eue eur eut m-r mbb mbc mbe mbm mbr mbt mbu mc- mcb mcc mce mcm mcr mct mcu meb mec mee mem mer met meu mmb mmc mme mmm mmr mmt mmu mrb mrc mre mrm mrr mrt mru mtb mtc mte mtm mtr mtt mtu mub muc mue mum mur mut muu rbb rbc rbe rbm rbr rbt rbu rcb rcc rce rcm rcr rct rcu re- reb rec ree rem rer ret reu rmb rmc rme rmm rmr rmt rrb rrc rrm rrr rrt rru rtb rtc rte rtm rtr rtt rtu rub ruc rue rum rur rut ruu tbb tbc tbe tbm tbr tbt tbu tcb tcc tce tcm tcr tct tcu te- teb tec tee tem ter tet teu tmb tmc tme tmm tmr tmt tmu trb trc tre trm trr trt tru ttb ttc tte ttm ttr ttt ttu tub tuc tue tum tur tut tuu ubb ubc ube ubr ubt ubu ucb ucc uce ucm ucr uct ucu ueb uec uee uem uer uet um- umb umc ume umm umr umt umu ur- urb urc ure urm urr urt uru utb utc ute utm utr utt utu uuc uue uum uur uut uuu