-er a-a aaa aae aak aao aap aar aea aee aek aeo aep aer aka ake akk ako akp akr aoa aoe aok aoo aop aor ap- apa ape apk apo app apr ar- ara are ark aro arp arr eaa eae eak eao eap ear eea eee eek eeo eep eer eka eke eko ekp ekr eo- eoa eoe eok eoo eop eor ep- epa epe epo epp epr era ere erk ero erp err ka- kaa kae kak kao kap kar ke- kea kee kek keo kep ker kke kkk kkp kkr koa koe kok koo kop kor kpa kpe kpk kpo kpp kpr kra krk kro krp krr oaa oae oak oao oap oar oea oee oeo oep oer oka oke okk oko okp okr oo- ooa ook ooo oop oor op- opa ope opk opo opp opr or- ora ore ork oro orp orr p-p paa pae pak pao pap par pea pee pek peo pep per pka pke pko pkp pkr poa poe pok poo pop por ppa ppe ppk ppo ppp ppr pra pre prk pro prp prr ra- raa rae rak rao rap rar re- rea ree rek reo rep rer rke rkk rko rkp roa roe rok roo rop ror rpa rpe rpk rpo rpp rpr rra rrk rrp rrr