-er b-p bbb bbd bbe bbi bbp bbr bbs bbt bdb bdd bde bdi bdp bdr bds bdt be- beb bed bee bei bep ber bes bet bi- bib bid bie bii bip bir bis bit bpb bpd bpe bpi bpp bpr bps bpt brb brd bre bri brp brr brs brt bsb bsd bse bsi bsp bsr bss bst btb btd bte bti btp btr bts btt dbb dbd dbe dbi dbp dbr dbs dbt ddb ddd dde ddi ddp ddr dds ddt de- deb ded dee dei dep der des det di- dib did die dii dip dir dis dit dpb dpd dpe dpi dpp dpr dps dpt drb drd dre dri drp drr drs drt dsb dsd dse dsi dsp dsr dss dst dtb dtd dte dti dtp dtr dts dtt ebb ebd ebe ebi ebp ebr ebs ebt ed- edb edd ede edi edp edr eds edt eeb eed eee eep eer ees eet eib eid eie eii eip eir eis eit ep- epb epd epe epi epp epr eps ept erb erd ere eri erp err ers ert es- esb esd ese esi esp esr ess est etb etd ete eti etp etr ets ett i-d ibb ibd ibe ibi ibp ibr ibs ibt idb idd ide idi idp idr ids idt ie- ied iee iei iep ier ies iet iib iid iie iii iip iir iis iit ipb ipd ipe ipi ipp ipr ips ipt ir- irb ird ire iri irp irr irs irt is- isb isd ise isi isp isr iss ist itb itd ite iti itp its itt p-p pbb pbd pbe pbi pbp pbr pbs pbt pdb pdd pde pdi pdp pdr pds pdt peb ped pee pei pep per pes pet pib pid pie pii pip pir pis pit ppb ppd ppe ppi ppp ppr pps ppt prb prd pre pri prp prr prs prt ps- psb psd pse psi psp psr pss pst pt- ptb ptd pte pti ptp ptr pts ptt rbb rbd rbe rbi rbp rbr rbs rbt rdb rdd rde rdi rdp rdr rds rdt re- reb red ree rei rep rer res ret rib rid rie rii rip rir ris rit rpb rpd rpe rpi rpp rpr rps rpt rrb rrd rri rrp rrr rrs rrt rsb rsd rse rsi rsp rsr rss rst rtb rtd rte rti rtp rtr rts rtt sbb sbd sbe sbi sbp sbr sbs sbt sdb sdd sde sdi sdp sdr sds sdt se- seb sed see sei sep ser ses set sib sid sie sii sip sir sis sit spb spd spe spi spp spr sps spt sr- srb srd sre sri srp srr srs srt ss- ssb ssd sse ssi ssp ssr sss sst stb std ste sti stp str sts stt tbb tbd tbe tbi tbp tbr tbs tbt tdb tdd tde tdi tdp tdr tds tdt te- teb ted tee tei tep ter tes tet tib tid tie tii tip tir tis tit tpb tpd tpe tpi tpp tpr tps tpt trb trd tre tri trp trr trs trt tsb tsd tse tsi tsp tsr tss tst ttb ttd tte tti ttp ttr tts ttt