-er b-p bbb bbd bbe bbi bbp bbr bdb bdd bde bdi bdp bdr be- beb bed bee bei bep ber bi- bib bid bie bii bip bir bpb bpd bpe bpi bpp bpr brb brd bre bri brp brr dbb dbd dbe dbi dbp dbr ddb ddd dde ddi ddp ddr de- deb ded dee dei dep der di- dib did die dii dip dir dpb dpd dpe dpi dpp dpr drb drd dre dri drp drr ebb ebd ebe ebi ebp ebr ed- edb edd ede edi edp edr eeb eed eee eep eer eib eid eie eii eip eir ep- epb epd epe epi epp epr erb erd ere eri erp err i-d ibb ibd ibe ibi ibp ibr idb idd ide idi idp idr ie- ied iee iei iep ier iib iid iie iii iip iir ipb ipd ipe ipi ipp ipr ir- irb ird ire iri irp irr p-p pbb pbd pbe pbi pbp pbr pdb pdd pde pdi pdp pdr peb ped pee pei pep per pib pid pie pii pip pir ppb ppd ppe ppi ppp ppr prb prd pre pri prp prr rbb rbd rbe rbi rbp rbr rdb rdd rde rdi rdp rdr re- reb red ree rei rep rer rib rid rie rii rip rir rpb rpd rpe rpi rpp rpr rrb rrd rri rrp rrr