a-a aaa aak aao aap aar aas aka akk ako akp akr aks aoa aok aoo aop aor aos ap- apa apk apo app apr aps ar- ara ark aro arp arr ars as- asa ask aso asp asr ass ka- kaa kak kao kap kar kas kkk kkp kkr kks koa kok koo kop kor kos kpa kpk kpo kpp kpr kps kra krk kro krp krr krs ksa ksk kso ksp ksr kss oaa oak oao oap oar oas oka okk oko okp okr oks oo- ooa ook ooo oop oor oos op- opa opk opo opp opr ops or- ora ork oro orp orr ors os- osa osk oso osp osr oss p-p paa pak pao pap par pas pka pko pkp pkr pks poa pok poo pop por pos ppa ppk ppo ppp ppr pps pra prk pro prp prr prs ps- psa psk pso psp psr pss ra- raa rak rao rap rar ras rkk rko rkp rks roa rok roo rop ror ros rpa rpk rpo rpp rpr rps rra rrk rrp rrr rrs rsa rsk rso rsp rsr rss saa sak sao sap sar sas sk- ska skk sko skp skr sks soa sok soo sop sor sos spa spk spo spp spr sps sr- sra srk sro srp srr srs ss- ssa ssk sso ssp ssr sss