-er -ic b-u bbb bbc bbe bbi bbm bbr bbt bbu bcb bcc bce bci bcm bcr bct bcu be- beb bec bee bei bem ber bet beu bi- bib bic bie bii bim bir bit biu bmb bmc bme bmi bmm bmr bmt bmu brb bre bri brm brr brt bru btb btc bte bti btm btr btt btu bub buc bue bui bum bur but buu c-- cbb cbc cbe cbi cbm cbr cbt cbu ccb ccc cce cci ccm ccr cct ccu ce- ceb cec cee cei cem cer cet ceu ci- cib cic cie cii cim cir cit ciu cmb cmc cme cmi cmm cmr cmt cmu crb crc cre cri crm crr crt cru ctb ctc cte cti ctm ctr ctt ctu cub cuc cue cui cum cur cut cuu ebb ebc ebe ebi ebm ebr ebt ebu ec- ecb ecc ece eci ecm ecr ect ecu eeb eec eee eem eer eet eib eic eie eii eim eir eit eiu em- emb emc eme emi emm emr emt emu erb erc ere eri erm err ert eru etb etc ete eti etm etr ett etu eu- eub euc eue eui eur eut ibb ibc ibe ibi ibm ibr ibt ibu icb icc ice ici icm icr ict icu ie- iec iee iei iem ier iet iib iic iie iii iim iir iit iiu im- imb imc ime imi imm imt imu ir- irb irc ire iri irm irr irt iru itb itc ite iti itm itt itu iu- iub iuc iue iui ium iur iut m-r mbb mbc mbe mbi mbm mbr mbt mbu mc- mcb mcc mce mci mcm mcr mct mcu meb mec mee mei mem mer met meu mi- mib mic mie mii mim mir mit miu mmb mmc mme mmi mmm mmr mmt mmu mrb mrc mre mri mrm mrr mrt mru mtb mtc mte mti mtm mtr mtt mtu mub muc mue mui mum mur mut muu rbb rbc rbe rbi rbm rbr rbt rbu rcb rcc rce rci rcm rcr rct rcu re- reb rec ree rei rem rer ret reu rib ric rie rii rim rir rit rmb rmc rme rmi rmm rmr rmt rrb rrc rri rrm rrr rrt rru rtb rtc rte rti rtm rtr rtt rtu rub ruc rue rui rum rur rut ruu tbb tbc tbe tbi tbm tbr tbt tbu tcb tcc tce tci tcm tcr tct tcu te- teb tec tee tei tem ter tet teu tib tic tie tii tim tir tit tiu tmb tmc tme tmi tmm tmr tmt tmu trb trc tre tri trm trr trt tru ttb ttc tte tti ttm ttr ttt ttu tub tuc tue tui tum tur tut tuu ubb ubc ube ubi ubr ubt ubu ucb ucc uce uci ucm ucr uct ucu ueb uec uee uei uem uer uet uib uic uie uii uim uir uit uiu um- umb umc ume umi umm umr umt umu ur- urb urc ure uri urm urr urt uru utb utc ute uti utm utr utt utu uuc uue uum uur uut uuu