-er bbb bbe bbi bbm bbo bbr bbs be- beb bee bei bem beo ber bes bi- bib bie bii bim bio bir bis bmb bme bmi bmm bmo bmr bms bob boe boi bom boo bor bos brb bre bri brm bro brr brs bsb bse bsi bsm bso bsr bss ebb ebe ebi ebm ebo ebr ebs eeb eee eem eeo eer ees eib eie eii eim eio eir eis em- emb eme emi emm emo emr ems eo- eob eoe eoi eom eoo eor eos erb ere eri erm ero err ers es- esb ese esi esm eso esr ess ibb ibe ibi ibm ibo ibr ibs ie- iee iei iem ier ies iib iie iii iim iio iir iis im- imb ime imi imm imo ims io- iob ioe ioi iom ioo ior ios ir- irb ire iri irm iro irr irs is- isb ise isi ism iso isr iss m-o m-r mbb mbe mbi mbm mbo mbr mbs meb mee mei mem meo mer mes mi- mib mie mii mim mio mir mis mmb mme mmi mmm mmo mmr mms mob moe moi mom moo mor mos mrb mre mri mrm mro mrr mrs msb mse msi msm mso msr mss o-i ob- obb obe obi obm obo obr obs oeb oee oei oem oeo oer oes oib oie oii oim oio oir ois om- omb ome omi omm omo omr oms oo- oob ooi oom ooo oor oos or- orb ore ori orm oro orr ors os- osb ose osi osm oso osr oss rbb rbe rbi rbm rbo rbr rbs re- reb ree rei rem reo rer res rib rie rii rim rio rir ris rmb rme rmi rmm rmo rmr rms rob roe roi rom roo ror ros rrb rri rrm rrr rrs rsb rse rsi rsm rso rsr rss sbb sbe sbi sbm sbo sbr sbs se- seb see sei sem seo ser ses sib sie sii sim sio sir sis smb sme smi smm smo smr sms sob soe soi som soo sor sos sr- srb sre sri srm sro srr srs ss- ssb sse ssi ssm sso ssr sss