-er bbb bbe bbi bbm bbr bbs bbt be- beb bee bei bem ber bes bet bi- bib bie bii bim bir bis bit bmb bme bmi bmm bmr bms bmt brb bre bri brm brr brs brt bsb bse bsi bsm bsr bss bst btb bte bti btm btr bts btt ebb ebe ebi ebm ebr ebs ebt eeb eee eem eer ees eet eib eie eii eim eir eis eit em- emb eme emi emm emr ems emt erb ere eri erm err ers ert es- esb ese esi esm esr ess est etb ete eti etm etr ets ett ibb ibe ibi ibm ibr ibs ibt ie- iee iei iem ier ies iet iib iie iii iim iir iis iit im- imb ime imi imm ims imt ir- irb ire iri irm irr irs irt is- isb ise isi ism isr iss ist itb ite iti itm its itt m-r mbb mbe mbi mbm mbr mbs mbt meb mee mei mem mer mes met mi- mib mie mii mim mir mis mit mmb mme mmi mmm mmr mms mmt mrb mre mri mrm mrr mrs mrt msb mse msi msm msr mss mst mtb mte mti mtm mtr mts mtt rbb rbe rbi rbm rbr rbs rbt re- reb ree rei rem rer res ret rib rie rii rim rir ris rit rmb rme rmi rmm rmr rms rmt rrb rri rrm rrr rrs rrt rsb rse rsi rsm rsr rss rst rtb rte rti rtm rtr rts rtt sbb sbe sbi sbm sbr sbs sbt se- seb see sei sem ser ses set sib sie sii sim sir sis sit smb sme smi smm smr sms smt sr- srb sre sri srm srr srs srt ss- ssb sse ssi ssm ssr sss sst stb ste sti stm str sts stt tbb tbe tbi tbm tbr tbs tbt te- teb tee tei tem ter tes tet tib tie tii tim tir tis tit tmb tme tmi tmm tmr tms tmt trb tre tri trm trr trs trt tsb tse tsi tsm tsr tss tst ttb tte tti ttm ttr tts ttt