-er b-p bbb bbe bbm bbo bbp bbr bbs bbt be- beb bee bem beo bep ber bes bet bmb bme bmm bmo bmp bmr bms bmt bob boe bom boo bop bor bos bot bpb bpe bpm bpo bpp bpr bps bpt brb bre brm bro brp brr brs brt bsb bse bsm bso bsp bsr bss bst btb bte btm bto btp btr bts btt ebb ebe ebm ebo ebp ebr ebs ebt eeb eee eem eeo eep eer ees eet em- emb eme emm emo emp emr ems emt eo- eob eoe eom eoo eop eor eos eot ep- epb epe epm epo epp epr eps ept erb ere erm ero erp err ers ert es- esb ese esm eso esp esr ess est etb ete etm eto etp etr ets ett m-o m-r mbb mbe mbm mbo mbp mbr mbs mbt meb mee mem meo mep mer mes met mmb mme mmm mmo mmp mmr mms mmt mob moe mom moo mop mor mos mot mpb mpe mpm mpo mpp mpr mps mpt mrb mre mrm mro mrp mrr mrs mrt msb mse msm mso msp msr mss mst mtb mte mtm mto mtp mtr mts mtt ob- obb obe obm obo obp obr obs obt oeb oee oem oeo oep oer oes oet om- omb ome omm omo omp omr oms omt oo- oob oom ooo oop oor oos oot op- opb ope opm opo opp opr ops opt or- orb ore orm oro orp orr ors ort os- osb ose osm oso osp osr oss ost ot- otb ote otm oto otp otr ots ott p-p pbb pbe pbm pbo pbp pbr pbs pbt peb pee pem peo pep per pes pet pmb pme pmm pmo pmp pmr pms pmt pob poe pom poo pop por pos pot ppb ppe ppm ppo ppp ppr pps ppt prb pre prm pro prp prr prs prt ps- psb pse psm pso psp psr pss pst pt- ptb pte ptm pto ptp ptr pts ptt rbb rbe rbm rbo rbp rbr rbs rbt re- reb ree rem reo rep rer res ret rmb rme rmm rmo rmp rmr rms rmt rob roe rom roo rop ror ros rot rpb rpe rpm rpo rpp rpr rps rpt rrb rrm rrp rrr rrs rrt rsb rse rsm rso rsp rsr rss rst rtb rte rtm rto rtp rtr rts rtt sbb sbe sbm sbo sbp sbr sbs sbt se- seb see sem seo sep ser ses set smb sme smm smo smp smr sms smt sob soe som soo sop sor sos sot spb spe spm spo spp spr sps spt sr- srb sre srm sro srp srr srs srt ss- ssb sse ssm sso ssp ssr sss sst stb ste stm sto stp str sts stt tbb tbe tbm tbo tbp tbr tbs tbt te- teb tee tem teo tep ter tes tet tmb tme tmm tmo tmp tmr tms tmt to- tob toe tom too top tor tos tot tpb tpe tpm tpo tpp tpr tps tpt trb tre trm tro trp trr trs trt tsb tse tsm tso tsp tsr tss tst ttb tte ttm tto ttp ttr tts ttt