-er b-p bbb bbd bbe bbi bbp bbr bbt bdb bdd bde bdi bdp bdr bdt be- beb bed bee bei bep ber bet bi- bib bid bie bii bip bir bit bpb bpd bpe bpi bpp bpr bpt brb brd bre bri brp brr brt btb btd bte bti btp btr btt dbb dbd dbe dbi dbp dbr dbt ddb ddd dde ddi ddp ddr ddt de- deb ded dee dei dep der det di- dib did die dii dip dir dit dpb dpd dpe dpi dpp dpr dpt drb drd dre dri drp drr drt dtb dtd dte dti dtp dtr dtt ebb ebd ebe ebi ebp ebr ebt ed- edb edd ede edi edp edr edt eeb eed eee eep eer eet eib eid eie eii eip eir eit ep- epb epd epe epi epp epr ept erb erd ere eri erp err ert etb etd ete eti etp etr ett i-d ibb ibd ibe ibi ibp ibr ibt idb idd ide idi idp idr idt ie- ied iee iei iep ier iet iib iid iie iii iip iir iit ipb ipd ipe ipi ipp ipr ipt ir- irb ird ire iri irp irr irt itb itd ite iti itp itt p-p pbb pbd pbe pbi pbp pbr pbt pdb pdd pde pdi pdp pdr pdt peb ped pee pei pep per pet pib pid pie pii pip pir pit ppb ppd ppe ppi ppp ppr ppt prb prd pre pri prp prr prt pt- ptb ptd pte pti ptp ptr ptt rbb rbd rbe rbi rbp rbr rbt rdb rdd rde rdi rdp rdr rdt re- reb red ree rei rep rer ret rib rid rie rii rip rir rit rpb rpd rpe rpi rpp rpr rpt rrb rrd rri rrp rrr rrt rtb rtd rte rti rtp rtr rtt tbb tbd tbe tbi tbp tbr tbt tdb tdd tde tdi tdp tdr tdt te- teb ted tee tei tep ter tet tib tid tie tii tip tir tit tpb tpd tpe tpi tpp tpr tpt trb trd tre tri trp trr trt ttb ttd tte tti ttp ttr ttt