-er b-p bbb bbd bbe bbi bbk bbp bbr bdb bdd bde bdi bdk bdp bdr be- beb bed bee bei bek bep ber bi- bib bid bie bii bik bip bir bkb bke bkk bkp bkr bpb bpd bpe bpi bpp bpr brb brd bre bri brk brp brr dbb dbd dbe dbi dbk dbp dbr ddb ddd dde ddi ddk ddp ddr de- deb ded dee dei dek dep der di- dib did die dii dik dip dir dkb dke dki dkk dkp dkr dpb dpd dpe dpi dpk dpp dpr drb drd dre dri drk drp drr ebb ebd ebe ebi ebk ebp ebr ed- edb edd ede edi edk edp edr eeb eed eee eek eep eer eib eid eie eii eik eip eir ekb ekd eke eki ekp ekr ep- epb epd epe epi epp epr erb erd ere eri erk erp err i-d ibb ibd ibe ibi ibk ibp ibr idb idd ide idi idk idp idr ie- ied iee iei iek iep ier iib iid iie iii iip iir ikb ike iki ikk ikr ipb ipd ipe ipi ipp ipr ir- irb ird ire iri irk irp irr kbb kbd kbe kbi kbk kbp kbr kdb kde kdk kdp kdr ke- keb ked kee kei kek kep ker kib kid kie kii kik kip kir kkb kke kki kkk kkp kkr kpd kpe kpi kpk kpp kpr krd kri krk krp krr p-p pbb pbd pbe pbi pbk pbp pbr pdb pdd pde pdi pdk pdp pdr peb ped pee pei pek pep per pib pid pie pii pik pip pir pkb pkd pke pki pkp pkr ppb ppd ppe ppi ppk ppp ppr prb prd pre pri prk prp prr rbb rbd rbe rbi rbk rbp rbr rdb rdd rde rdi rdp rdr re- reb red ree rei rek rep rer rib rid rie rii rik rip rir rkb rke rkk rkp rpb rpd rpe rpi rpk rpp rpr rrb rrd rri rrk rrp rrr