-er b-p bbb bbd bbe bbi bbp bbr bbs bdb bdd bde bdi bdp bdr bds be- beb bed bee bei bep ber bes bi- bib bid bie bii bip bir bis bpb bpd bpe bpi bpp bpr bps brb brd bre bri brp brr brs bsb bsd bse bsi bsp bsr bss dbb dbd dbe dbi dbp dbr dbs ddb ddd dde ddi ddp ddr dds de- deb ded dee dei dep der des di- dib did die dii dip dir dis dpb dpd dpe dpi dpp dpr dps drb drd dre dri drp drr drs dsb dsd dse dsi dsp dsr dss ebb ebd ebe ebi ebp ebr ebs ed- edb edd ede edi edp edr eds eeb eed eee eep eer ees eib eid eie eii eip eir eis ep- epb epd epe epi epp epr eps erb erd ere eri erp err ers es- esb esd ese esi esp esr ess i-d ibb ibd ibe ibi ibp ibr ibs idb idd ide idi idp idr ids ie- ied iee iei iep ier ies iib iid iie iii iip iir iis ipb ipd ipe ipi ipp ipr ips ir- irb ird ire iri irp irr irs is- isb isd ise isi isp isr iss p-p pbb pbd pbe pbi pbp pbr pbs pdb pdd pde pdi pdp pdr pds peb ped pee pei pep per pes pib pid pie pii pip pir pis ppb ppd ppe ppi ppp ppr pps prb prd pre pri prp prr prs ps- psb psd pse psi psp psr pss rbb rbd rbe rbi rbp rbr rbs rdb rdd rde rdi rdp rdr rds re- reb red ree rei rep rer res rib rid rie rii rip rir ris rpb rpd rpe rpi rpp rpr rps rrb rrd rri rrp rrr rrs rsb rsd rse rsi rsp rsr rss sbb sbd sbe sbi sbp sbr sbs sdb sdd sde sdi sdp sdr sds se- seb sed see sei sep ser ses sib sid sie sii sip sir sis spb spd spe spi spp spr sps sr- srb srd sre sri srp srr srs ss- ssb ssd sse ssi ssp ssr sss