-er -ic bbb bbc bbe bbi bbm bbo bbr bbs bcb bcc bce bci bcm bco bcr bcs be- beb bec bee bei bem beo ber bes bi- bib bic bie bii bim bio bir bis bmb bmc bme bmi bmm bmo bmr bms bob boc boe boi bom boo bor bos brb bre bri brm bro brr brs bsb bsc bse bsi bsm bso bsr bss c-- cbb cbc cbe cbi cbm cbo cbr cbs ccb ccc cce cci ccm cco ccr ccs ce- ceb cec cee cei cem ceo cer ces ci- cib cic cie cii cim cio cir cis cmb cmc cme cmi cmm cmo cmr cms co- cob coc coe coi com coo cor cos crb crc cre cri crm cro crr crs csb csc cse csi csm cso csr css ebb ebc ebe ebi ebm ebo ebr ebs ec- ecb ecc ece eci ecm eco ecr ecs eeb eec eee eem eeo eer ees eib eic eie eii eim eio eir eis em- emb emc eme emi emm emo emr ems eo- eob eoc eoe eoi eom eoo eor eos erb erc ere eri erm ero err ers es- esb esc ese esi esm eso esr ess ibb ibc ibe ibi ibm ibo ibr ibs icb icc ice ici icm ico icr ics ie- iec iee iei iem ier ies iib iic iie iii iim iio iir iis im- imb imc ime imi imm imo ims io- iob ioc ioe ioi iom ioo ior ios ir- irb irc ire iri irm iro irr irs is- isb isc ise isi ism iso isr iss m-o m-r mbb mbc mbe mbi mbm mbo mbr mbs mc- mcb mcc mce mci mcm mco mcr mcs meb mec mee mei mem meo mer mes mi- mib mic mie mii mim mio mir mis mmb mmc mme mmi mmm mmo mmr mms mob moc moe moi mom moo mor mos mrb mrc mre mri mrm mro mrr mrs msb msc mse msi msm mso msr mss o-i ob- obb obc obe obi obm obo obr obs oc- ocb occ oci ocm oco ocr ocs oeb oec oee oei oem oeo oer oes oib oic oie oii oim oio oir ois om- omb omc ome omi omm omo omr oms oo- oob ooc ooi oom ooo oor oos or- orb orc ore ori orm oro orr ors os- osb osc ose osi osm oso osr oss rbb rbc rbe rbi rbm rbo rbr rbs rcb rcc rce rci rcm rco rcr rcs re- reb rec ree rei rem reo rer res rib ric rie rii rim rio rir ris rmb rmc rme rmi rmm rmo rmr rms rob roc roe roi rom roo ror ros rrb rrc rri rrm rrr rrs rsb rsc rse rsi rsm rso rsr rss sbb sbc sbe sbi sbm sbo sbr sbs scb scc sce sci scm sco scr scs se- seb sec see sei sem seo ser ses sib sic sie sii sim sio sir sis smb smc sme smi smm smo smr sms sob soc soe soi som soo sor sos sr- srb src sre sri srm sro srr srs ss- ssb ssc sse ssi ssm sso ssr sss