a-a aaa aaf aak aap aar aas af- afa aff afk afp afr afs aka akk akp akr aks ap- apa apf apk app apr aps ar- ara arf ark arp arr ars as- asa asf ask asp asr ass faa faf fak fap far fas ffa fff ffk ffp ffr ffs fka fkf fkk fkp fpa fpk fpp fpr fps fra frf frk frp frr frs fsa fsf fsk fsp fsr fss ka- kaa kaf kak kap kar kas kfa kff kfs kkk kkp kkr kks kpa kpf kpk kpp kpr kps kra krf krk krp krr krs ksa ksf ksk ksp ksr kss p-p paa paf pak pap par pas pfa pff pfk pfp pfr pfs pka pkf pkp pkr pks ppa ppf ppk ppp ppr pps pra prf prk prp prr prs ps- psa psf psk psp psr pss ra- raa raf rak rap rar ras rfa rff rfk rfp rfr rfs rkf rkk rkp rks rpa rpf rpk rpp rpr rps rra rrf rrk rrp rrr rrs rsa rsf rsk rsp rsr rss saa saf sak sap sar sas sfa sff sfk sfp sfr sfs sk- ska skf skk skp skr sks spa spf spk spp spr sps sr- sra srf srk srp srr srs ss- ssa ssf ssk ssp ssr sss