-er b-p bbb bbd bbe bbo bbp bbr bbs bdb bdd bde bdo bdp bdr bds be- beb bed bee beo bep ber bes bob bod boe boo bop bor bos bpb bpd bpe bpo bpp bpr bps brb brd bre bro brp brr brs bsb bsd bse bso bsp bsr bss dbb dbd dbe dbo dbp dbr dbs ddb ddd dde ddo ddp ddr dds de- deb ded dee deo dep der des dob dod doe doo dop dor dos dpb dpd dpe dpo dpp dpr dps drb drd dre dro drp drr drs dsb dsd dse dso dsp dsr dss ebb ebd ebe ebo ebp ebr ebs ed- edb edd ede edo edp edr eds eeb eed eee eeo eep eer ees eo- eob eod eoe eoo eop eor eos ep- epb epd epe epo epp epr eps erb erd ere ero erp err ers es- esb esd ese eso esp esr ess ob- obb obd obe obo obp obr obs odb odd ode odo odp odr ods oeb oed oee oeo oep oer oes oo- oob ood ooo oop oor oos op- opb opd ope opo opp opr ops or- orb ord ore oro orp orr ors os- osb osd ose oso osp osr oss p-p pbb pbd pbe pbo pbp pbr pbs pdb pdd pde pdo pdp pdr pds peb ped pee peo pep per pes pob pod poe poo pop por pos ppb ppd ppe ppo ppp ppr pps prb prd pre pro prp prr prs ps- psb psd pse pso psp psr pss rbb rbd rbe rbo rbp rbr rbs rdb rdd rde rdo rdp rdr rds re- reb red ree reo rep rer res rob rod roe roo rop ror ros rpb rpd rpe rpo rpp rpr rps rrb rrd rrp rrr rrs rsb rsd rse rso rsp rsr rss sbb sbd sbe sbo sbp sbr sbs sdb sdd sde sdo sdp sdr sds se- seb sed see seo sep ser ses sob sod soe soo sop sor sos spb spd spe spo spp spr sps sr- srb srd sre sro srp srr srs ss- ssb ssd sse sso ssp ssr sss