-er a-a aaa aae aak aao aap aar aas aea aee aek aeo aep aer aes aka ake akk ako akp akr aks aoa aoe aok aoo aop aor aos ap- apa ape apk apo app apr aps ar- ara are ark aro arp arr ars as- asa ase ask aso asp asr ass eaa eae eak eao eap ear eas eea eee eek eeo eep eer ees eka eke eko ekp ekr eks eo- eoa eoe eok eoo eop eor eos ep- epa epe epo epp epr eps era ere erk ero erp err ers es- esa ese esk eso esp esr ess ka- kaa kae kak kao kap kar kas ke- kea kee kek keo kep ker kes kke kkk kkp kkr kks koa koe kok koo kop kor kos kpa kpe kpk kpo kpp kpr kps kra krk kro krp krr krs ksa kse ksk kso ksp ksr kss oaa oae oak oao oap oar oas oea oee oeo oep oer oes oka oke okk oko okp okr oks oo- ooa ook ooo oop oor oos op- opa ope opk opo opp opr ops or- ora ore ork oro orp orr ors os- osa ose osk oso osp osr oss p-p paa pae pak pao pap par pas pea pee pek peo pep per pes pka pke pko pkp pkr pks poa poe pok poo pop por pos ppa ppe ppk ppo ppp ppr pps pra pre prk pro prp prr prs ps- psa pse psk pso psp psr pss ra- raa rae rak rao rap rar ras re- rea ree rek reo rep rer res rke rkk rko rkp rks roa roe rok roo rop ror ros rpa rpe rpk rpo rpp rpr rps rra rrk rrp rrr rrs rsa rse rsk rso rsp rsr rss saa sae sak sao sap sar sas se- sea see sek seo sep ser ses sk- ska ske skk sko skp skr sks soa soe sok soo sop sor sos spa spe spk spo spp spr sps sr- sra sre srk sro srp srr srs ss- ssa sse ssk sso ssp ssr sss