-er b-p bbb bbd bbe bbi bbk bbo bbp bbr bdb bdd bde bdi bdk bdo bdp bdr be- beb bed bee bei bek beo bep ber bi- bib bid bie bii bik bio bip bir bkb bke bkk bko bkp bkr bob bod boe boi bok boo bop bor bpb bpd bpe bpi bpo bpp bpr brb brd bre bri brk bro brp brr dbb dbd dbe dbi dbk dbo dbp dbr ddb ddd dde ddi ddk ddo ddp ddr de- deb ded dee dei dek deo dep der di- dib did die dii dik dio dip dir dkb dke dki dkk dko dkp dkr dob dod doe doi dok doo dop dor dpb dpd dpe dpi dpk dpo dpp dpr drb drd dre dri drk dro drp drr ebb ebd ebe ebi ebk ebo ebp ebr ed- edb edd ede edi edk edo edp edr eeb eed eee eek eeo eep eer eib eid eie eii eik eio eip eir ekb ekd eke eki eko ekp ekr eo- eob eod eoe eoi eok eoo eop eor ep- epb epd epe epi epo epp epr erb erd ere eri erk ero erp err i-d ibb ibd ibe ibi ibk ibo ibp ibr idb idd ide idi idk ido idp idr ie- ied iee iei iek iep ier iib iid iie iii iio iip iir ikb ike iki ikk iko ikr io- iob iod ioe ioi ioo iop ior ipb ipd ipe ipi ipo ipp ipr ir- irb ird ire iri irk iro irp irr kbb kbd kbe kbi kbk kbo kbp kbr kdb kde kdk kdo kdp kdr ke- keb ked kee kei kek keo kep ker kib kid kie kii kik kio kip kir kkb kke kki kkk kkp kkr kob kod koe koi kok koo kop kor kpd kpe kpi kpk kpo kpp kpr krd kri krk kro krp krr o-i ob- obb obd obe obi obk obo obp obr odb odd ode odi odo odp odr oeb oed oee oei oeo oep oer oib oid oie oii oik oio oip oir okb okd oke oki okk oko okp okr oo- oob ood ooi ook ooo oop oor op- opb opd ope opi opk opo opp opr or- orb ord ore ori ork oro orp orr p-p pbb pbd pbe pbi pbk pbo pbp pbr pdb pdd pde pdi pdk pdo pdp pdr peb ped pee pei pek peo pep per pib pid pie pii pik pio pip pir pkb pkd pke pki pko pkp pkr pob pod poe poi pok poo pop por ppb ppd ppe ppi ppk ppo ppp ppr prb prd pre pri prk pro prp prr rbb rbd rbe rbi rbk rbo rbp rbr rdb rdd rde rdi rdo rdp rdr re- reb red ree rei rek reo rep rer rib rid rie rii rik rio rip rir rkb rke rkk rko rkp rob rod roe roi rok roo rop ror rpb rpd rpe rpi rpk rpo rpp rpr rrb rrd rri rrk rrp rrr