a-a a-c aaa aac aak aar aas ac- aca acc ack acr acs aka akc akk akr aks ar- ara arc ark arr ars as- asa asc ask asr ass c-- caa cac cak car cas cca ccc cck ccr ccs cka ckc cks cra crc crk crr crs csa csc csk csr css ka- kaa kac kak kar kas kca kcc kck kcr kcs kkc kkk kkr kks kra krc krk krr krs ksa ksc ksk ksr kss ra- raa rac rak rar ras rca rcc rcr rcs rkc rkk rks rra rrc rrk rrr rrs rsa rsc rsk rsr rss saa sac sak sar sas sca scc sck scr scs sk- ska skc skk skr sks sr- sra src srk srr srs ss- ssa ssc ssk ssr sss