-er -ic b-u bbb bbc bbe bbi bbm bbr bbs bbu bcb bcc bce bci bcm bcr bcs bcu be- beb bec bee bei bem ber bes beu bi- bib bic bie bii bim bir bis biu bmb bmc bme bmi bmm bmr bms bmu brb bre bri brm brr brs bru bsb bsc bse bsi bsm bsr bss bsu bub buc bue bui bum bur bus buu c-- cbb cbc cbe cbi cbm cbr cbs cbu ccb ccc cce cci ccm ccr ccs ccu ce- ceb cec cee cei cem cer ces ceu ci- cib cic cie cii cim cir cis ciu cmb cmc cme cmi cmm cmr cms cmu crb crc cre cri crm crr crs cru csb csc cse csi csm csr css csu cub cuc cue cui cum cur cus cuu ebb ebc ebe ebi ebm ebr ebs ebu ec- ecb ecc ece eci ecm ecr ecs ecu eeb eec eee eem eer ees eib eic eie eii eim eir eis eiu em- emb emc eme emi emm emr ems emu erb erc ere eri erm err ers eru es- esb esc ese esi esm esr ess esu eu- eub euc eue eui eur eus ibb ibc ibe ibi ibm ibr ibs ibu icb icc ice ici icm icr ics icu ie- iec iee iei iem ier ies iib iic iie iii iim iir iis iiu im- imb imc ime imi imm ims imu ir- irb irc ire iri irm irr irs iru is- isb isc ise isi ism isr iss isu iu- iub iuc iue iui ium iur ius m-r mbb mbc mbe mbi mbm mbr mbs mbu mc- mcb mcc mce mci mcm mcr mcs mcu meb mec mee mei mem mer mes meu mi- mib mic mie mii mim mir mis miu mmb mmc mme mmi mmm mmr mms mmu mrb mrc mre mri mrm mrr mrs mru msb msc mse msi msm msr mss msu mub muc mue mui mum mur mus muu rbb rbc rbe rbi rbm rbr rbs rbu rcb rcc rce rci rcm rcr rcs rcu re- reb rec ree rei rem rer res reu rib ric rie rii rim rir ris rmb rmc rme rmi rmm rmr rms rrb rrc rri rrm rrr rrs rru rsb rsc rse rsi rsm rsr rss rsu rub ruc rue rui rum rur rus ruu sbb sbc sbe sbi sbm sbr sbs sbu scb scc sce sci scm scr scs scu se- seb sec see sei sem ser ses seu sib sic sie sii sim sir sis siu smb smc sme smi smm smr sms smu sr- srb src sre sri srm srr srs ss- ssb ssc sse ssi ssm ssr sss ssu sub suc sue sui sum sur sus suu ubb ubc ube ubi ubr ubs ubu ucb ucc uce uci ucm ucr ucs ucu ueb uec uee uei uem uer ues uib uic uie uii uim uir uis uiu um- umb umc ume umi umm umr ums umu ur- urb urc ure uri urm urr urs uru usb usc use usi usm usr uss usu uuc uue uum uur uus uuu