a-a a-c aaa aac aak aap aar aas ac- aca acc ack acp acr acs aka akc akk akp akr aks ap- apa apc apk app apr aps ar- ara arc ark arp arr ars as- asa asc ask asp asr ass c-- caa cac cak cap car cas cca ccc cck ccp ccr ccs cka ckc cks cpa cpc cpk cpp cpr cps cra crc crk crp crr crs csa csc csk csp csr css ka- kaa kac kak kap kar kas kca kcc kck kcp kcr kcs kkc kkk kkp kkr kks kpa kpc kpk kpp kpr kps kra krc krk krp krr krs ksa ksc ksk ksp ksr kss p-p paa pac pak pap par pas pca pcc pck pcp pcr pcs pka pkc pkp pkr pks ppa ppc ppk ppp ppr pps pra prc prk prp prr prs ps- psa psc psk psp psr pss ra- raa rac rak rap rar ras rca rcc rcp rcr rcs rkc rkk rkp rks rpa rpc rpk rpp rpr rps rra rrc rrk rrp rrr rrs rsa rsc rsk rsp rsr rss saa sac sak sap sar sas sca scc sck scp scr scs sk- ska skc skk skp skr sks spa spc spk spp spr sps sr- sra src srk srp srr srs ss- ssa ssc ssk ssp ssr sss