-er b-p bbb bbd bbe bbn bbo bbp bbr bbs bdb bdd bde bdo bdp bdr bds be- beb bed bee ben beo bep ber bes bnb bnd bne bnn bno bnp bnr bns bob bod boe bon boo bop bor bos bpb bpd bpe bpn bpo bpp bpr bps brb brd bre brn bro brp brr brs bsb bsd bse bsn bso bsp bsr bss dbb dbd dbe dbn dbo dbp dbr dbs ddb ddd dde ddn ddo ddp ddr dds de- deb ded dee den deo dep der des dnb dnd dne dnn dno dnp dnr dns dob dod doe don doo dop dor dos dpb dpd dpe dpn dpo dpp dpr dps drb drd dre drn dro drp drr drs dsb dsd dse dsn dso dsp dsr dss ebb ebd ebe ebn ebo ebp ebr ebs ed- edb edd ede edn edo edp edr eds eeb eed eee een eeo eep eer ees en- enb end ene enn eno enp enr ens eo- eob eod eoe eon eoo eop eor eos ep- epb epd epe epn epo epp epr eps erb erd ere ern ero erp err ers es- esb esd ese esn eso esp esr ess nbb nbd nbe nbn nbo nbp nbr nbs ndb ndd nde ndn ndo ndp ndr nds ne- neb ned nee nen neo nep ner nes nnb nne nnn nno nnp nns no- nob nod noe non noo nop nor nos npb npd npe npn npo npp npr nps nrb nrd nre nrn nro nrp nrr nrs nsb nsd nse nsn nso nsp nsr nss ob- obb obd obe obn obo obp obr obs odb odd ode odn odo odp odr ods oeb oed oee oen oeo oep oer oes on- onb ond one onn ono onp onr ons oo- oob ood oon ooo oop oor oos op- opb opd ope opn opo opp opr ops or- orb ord ore orn oro orp orr ors os- osb osd ose osn oso osp osr oss p-p pbb pbd pbe pbn pbo pbp pbr pbs pdb pdd pde pdn pdo pdp pdr pds peb ped pee pen peo pep per pes pn- pnb pnd pne pnn pno pnp pnr pns pob pod poe pon poo pop por pos ppb ppd ppe ppn ppo ppp ppr pps prb prd pre prn pro prp prr prs ps- psb psd pse psn pso psp psr pss rbb rbd rbe rbn rbo rbp rbr rbs rdb rdd rde rdn rdo rdp rdr rds re- reb red ree ren reo rep rer res rnb rnd rnn rno rnp rnr rns rob rod roe ron roo rop ror ros rpb rpd rpe rpn rpo rpp rpr rps rrb rrd rrn rrp rrr rrs rsb rsd rse rsn rso rsp rsr rss sbb sbd sbe sbn sbo sbp sbr sbs sdb sdd sde sdn sdo sdp sdr sds se- seb sed see sen seo sep ser ses snb snd sne snn sno snp snr sns sob sod soe son soo sop sor sos spb spd spe spn spo spp spr sps sr- srb srd sre srn sro srp srr srs ss- ssb ssd sse ssn sso ssp ssr sss