-er a-a aaa aae aak aao aap aar aav aea aee aek aeo aep aer aev aka ake akk ako akp akr akv aoa aoe aok aoo aop aor aov ap- apa ape apk apo app apr apv ar- ara are ark aro arp arr arv av- ava ave avk avo avp avr eaa eae eak eao eap ear eav eea eee eek eeo eep eer eev eka eke eko ekp ekr ekv eo- eoa eoe eok eoo eop eor ep- epa epe epo epp epr era ere erk ero erp err erv eva eve evo evp evr evv ka- kaa kae kak kao kap kar kav ke- kea kee kek keo kep ker kev kke kkk kkp kkr kkv koa koe kok koo kop kor kpa kpe kpk kpo kpp kpr kpv kra krk kro krp krr krv kva kvk kvo kvp kvr kvv oaa oae oak oao oap oar oav oea oee oeo oep oer oka oke okk oko okp okr oo- ooa ook ooo oop oor oov op- opa ope opk opo opp opr opv or- ora ore ork oro orp orr orv ov- ova ove ovo ovp ovv p-p paa pae pak pao pap par pav pea pee pek peo pep per pev pka pke pko pkp pkr poa poe pok poo pop por pov ppa ppe ppk ppo ppp ppr ppv pra pre prk pro prp prr prv pva pve pvk pvo pvp pvr pvv ra- raa rae rak rao rap rar rav re- rea ree rek reo rep rer rev rke rkk rko rkp rkv roa roe rok roo rop ror rov rpa rpe rpk rpo rpp rpr rpv rra rrk rrp rrr rva rve rvo rvp rvr rvv v-a v-e vaa vae vak vao vap var vav vea vee vek veo vep ver vka vkp voa voe vok voo vop vor vov vpa vpe vpk vpo vpp vpr vra vre vrk vrp vrr vva vvo vvr vvv