-er a-a aaa aad aae aak aao aap aar ad- ada add ade adk ado adp adr aea aed aee aek aeo aep aer aka akd ake akk ako akp akr aoa aod aoe aok aoo aop aor ap- apa apd ape apk apo app apr ar- ara ard are ark aro arp arr daa dad dae dak dao dap dar dda ddd dde ddk ddo ddp ddr de- dea ded dee dek deo dep der dka dke dkk dko dkp dkr doa dod doe dok doo dop dor dpa dpd dpe dpk dpo dpp dpr dra drd dre drk dro drp drr eaa ead eae eak eao eap ear ed- eda edd ede edk edo edp edr eea eed eee eek eeo eep eer eka ekd eke eko ekp ekr eo- eoa eod eoe eok eoo eop eor ep- epa epd epe epo epp epr era erd ere erk ero erp err ka- kaa kad kae kak kao kap kar kda kde kdk kdo kdp kdr ke- kea ked kee kek keo kep ker kke kkk kkp kkr koa kod koe kok koo kop kor kpa kpd kpe kpk kpo kpp kpr kra krd krk kro krp krr oaa oad oae oak oao oap oar oda odd ode odo odp odr oea oed oee oeo oep oer oka okd oke okk oko okp okr oo- ooa ood ook ooo oop oor op- opa opd ope opk opo opp opr or- ora ord ore ork oro orp orr p-p paa pad pae pak pao pap par pda pdd pde pdk pdo pdp pdr pea ped pee pek peo pep per pka pkd pke pko pkp pkr poa pod poe pok poo pop por ppa ppd ppe ppk ppo ppp ppr pra prd pre prk pro prp prr ra- raa rad rae rak rao rap rar rda rdd rde rdo rdp rdr re- rea red ree rek reo rep rer rke rkk rko rkp roa rod roe rok roo rop ror rpa rpd rpe rpk rpo rpp rpr rra rrd rrk rrp rrr