a-a aaa aae aaf aak aao aap aea aee aef aek aeo aep af- afa afe aff afk afo afp aka ake akk ako akp aoa aoe aof aok aoo aop ap- apa ape apf apk apo app eaa eae eaf eak eao eap eea eee eef eek eeo eep ef- efa efe eff efo efp eka eke ekf eko ekp eo- eoa eoe eof eok eoo eop ep- epa epe epf epo epp faa fae faf fak fao fap fea fee fef fek feo fep ffa ffe fff ffk ffo ffp fka fkf fkk fkp foa foe fof fok foo fop fpa fpe fpk fpo fpp ka- kaa kae kaf kak kao kap ke- kea kee kef kek keo kep kfa kff kfo kke kkk kkp koa koe kof kok koo kop kpa kpe kpf kpk kpo kpp oaa oae oaf oak oao oap oea oee oef oeo oep of- ofa ofe off ofo ofp oka oke okk oko okp oo- ooa oof ook ooo oop op- opa ope opf opk opo opp p-p paa pae paf pak pao pap pea pee pef pek peo pep pfa pfe pff pfk pfo pfp pka pke pkf pko pkp poa poe pof pok poo pop ppa ppe ppf ppk ppo ppp