-er b-p bbb bbd bbe bbi bbo bbp bbr bbs bdb bdd bde bdi bdo bdp bdr bds be- beb bed bee bei beo bep ber bes bi- bib bid bie bii bio bip bir bis bob bod boe boi boo bop bor bos bpb bpd bpe bpi bpo bpp bpr bps brb brd bre bri bro brp brr brs bsb bsd bse bsi bso bsp bsr bss dbb dbd dbe dbi dbo dbp dbr dbs ddb ddd dde ddi ddo ddp ddr dds de- deb ded dee dei deo dep der des di- dib did die dii dio dip dir dis dob dod doe doi doo dop dor dos dpb dpd dpe dpi dpo dpp dpr dps drb drd dre dri dro drp drr drs dsb dsd dse dsi dso dsp dsr dss ebb ebd ebe ebi ebo ebp ebr ebs ed- edb edd ede edi edo edp edr eds eeb eed eee eeo eep eer ees eib eid eie eii eio eip eir eis eo- eob eod eoe eoi eoo eop eor eos ep- epb epd epe epi epo epp epr eps erb erd ere eri ero erp err ers es- esb esd ese esi eso esp esr ess i-d ibb ibd ibe ibi ibo ibp ibr ibs idb idd ide idi ido idp idr ids ie- ied iee iei iep ier ies iib iid iie iii iio iip iir iis io- iob iod ioe ioi ioo iop ior ios ipb ipd ipe ipi ipo ipp ipr ips ir- irb ird ire iri iro irp irr irs is- isb isd ise isi iso isp isr iss o-i ob- obb obd obe obi obo obp obr obs odb odd ode odi odo odp odr ods oeb oed oee oei oeo oep oer oes oib oid oie oii oio oip oir ois oo- oob ood ooi ooo oop oor oos op- opb opd ope opi opo opp opr ops or- orb ord ore ori oro orp orr ors os- osb osd ose osi oso osp osr oss p-p pbb pbd pbe pbi pbo pbp pbr pbs pdb pdd pde pdi pdo pdp pdr pds peb ped pee pei peo pep per pes pib pid pie pii pio pip pir pis pob pod poe poi poo pop por pos ppb ppd ppe ppi ppo ppp ppr pps prb prd pre pri pro prp prr prs ps- psb psd pse psi pso psp psr pss rbb rbd rbe rbi rbo rbp rbr rbs rdb rdd rde rdi rdo rdp rdr rds re- reb red ree rei reo rep rer res rib rid rie rii rio rip rir ris rob rod roe roi roo rop ror ros rpb rpd rpe rpi rpo rpp rpr rps rrb rrd rri rrp rrr rrs rsb rsd rse rsi rso rsp rsr rss sbb sbd sbe sbi sbo sbp sbr sbs sdb sdd sde sdi sdo sdp sdr sds se- seb sed see sei seo sep ser ses sib sid sie sii sio sip sir sis sob sod soe soi soo sop sor sos spb spd spe spi spo spp spr sps sr- srb srd sre sri sro srp srr srs ss- ssb ssd sse ssi sso ssp ssr sss