-er bbb bbe bbi bbm bbo bbr bbs bbt be- beb bee bei bem beo ber bes bet bi- bib bie bii bim bio bir bis bit bmb bme bmi bmm bmo bmr bms bmt bob boe boi bom boo bor bos bot brb bre bri brm bro brr brs brt bsb bse bsi bsm bso bsr bss bst btb bte bti btm bto btr bts btt ebb ebe ebi ebm ebo ebr ebs ebt eeb eee eem eeo eer ees eet eib eie eii eim eio eir eis eit em- emb eme emi emm emo emr ems emt eo- eob eoe eoi eom eoo eor eos eot erb ere eri erm ero err ers ert es- esb ese esi esm eso esr ess est etb ete eti etm eto etr ets ett ibb ibe ibi ibm ibo ibr ibs ibt ie- iee iei iem ier ies iet iib iie iii iim iio iir iis iit im- imb ime imi imm imo ims imt io- iob ioe ioi iom ioo ior ios iot ir- irb ire iri irm iro irr irs irt is- isb ise isi ism iso isr iss ist itb ite iti itm ito its itt m-o m-r mbb mbe mbi mbm mbo mbr mbs mbt meb mee mei mem meo mer mes met mi- mib mie mii mim mio mir mis mit mmb mme mmi mmm mmo mmr mms mmt mob moe moi mom moo mor mos mot mrb mre mri mrm mro mrr mrs mrt msb mse msi msm mso msr mss mst mtb mte mti mtm mto mtr mts mtt o-i ob- obb obe obi obm obo obr obs obt oeb oee oei oem oeo oer oes oet oib oie oii oim oio oir ois oit om- omb ome omi omm omo omr oms omt oo- oob ooi oom ooo oor oos oot or- orb ore ori orm oro orr ors ort os- osb ose osi osm oso osr oss ost ot- otb ote oti otm oto otr ots ott rbb rbe rbi rbm rbo rbr rbs rbt re- reb ree rei rem reo rer res ret rib rie rii rim rio rir ris rit rmb rme rmi rmm rmo rmr rms rmt rob roe roi rom roo ror ros rot rrb rri rrm rrr rrs rrt rsb rse rsi rsm rso rsr rss rst rtb rte rti rtm rto rtr rts rtt sbb sbe sbi sbm sbo sbr sbs sbt se- seb see sei sem seo ser ses set sib sie sii sim sio sir sis sit smb sme smi smm smo smr sms smt sob soe soi som soo sor sos sot sr- srb sre sri srm sro srr srs srt ss- ssb sse ssi ssm sso ssr sss sst stb ste sti stm sto str sts stt tbb tbe tbi tbm tbo tbr tbs tbt te- teb tee tei tem teo ter tes tet tib tie tii tim tio tir tis tit tmb tme tmi tmm tmo tmr tms tmt to- tob toe toi tom too tor tos tot trb tre tri trm tro trr trs trt tsb tse tsi tsm tso tsr tss tst ttb tte tti ttm tto ttr tts ttt