-er b-p bbb bbd bbe bbn bbp bbr bbs bdb bdd bde bdp bdr bds be- beb bed bee ben bep ber bes bnb bnd bne bnn bnp bnr bns bpb bpd bpe bpn bpp bpr bps brb brd bre brn brp brr brs bsb bsd bse bsn bsp bsr bss dbb dbd dbe dbn dbp dbr dbs ddb ddd dde ddn ddp ddr dds de- deb ded dee den dep der des dnb dnd dne dnn dnp dnr dns dpb dpd dpe dpn dpp dpr dps drb drd dre drn drp drr drs dsb dsd dse dsn dsp dsr dss ebb ebd ebe ebn ebp ebr ebs ed- edb edd ede edn edp edr eds eeb eed eee een eep eer ees en- enb end ene enn enp enr ens ep- epb epd epe epn epp epr eps erb erd ere ern erp err ers es- esb esd ese esn esp esr ess nbb nbd nbe nbn nbp nbr nbs ndb ndd nde ndn ndp ndr nds ne- neb ned nee nen nep ner nes nnb nne nnn nnp nns npb npd npe npn npp npr nps nrb nrd nre nrn nrp nrr nrs nsb nsd nse nsn nsp nsr nss p-p pbb pbd pbe pbn pbp pbr pbs pdb pdd pde pdn pdp pdr pds peb ped pee pen pep per pes pn- pnb pnd pne pnn pnp pnr pns ppb ppd ppe ppn ppp ppr pps prb prd pre prn prp prr prs ps- psb psd pse psn psp psr pss rbb rbd rbe rbn rbp rbr rbs rdb rdd rde rdn rdp rdr rds re- reb red ree ren rep rer res rnb rnd rnn rnp rnr rns rpb rpd rpe rpn rpp rpr rps rrb rrd rrn rrp rrr rrs rsb rsd rse rsn rsp rsr rss sbb sbd sbe sbn sbp sbr sbs sdb sdd sde sdn sdp sdr sds se- seb sed see sen sep ser ses snb snd sne snn snp snr sns spb spd spe spn spp spr sps sr- srb srd sre srn srp srr srs ss- ssb ssd sse ssn ssp ssr sss