a-a a-c aaa aac aad aak aar aas ac- aca acc acd ack acr acs ad- ada adc add adk adr ads aka akc akd akk akr aks ar- ara arc ard ark arr ars as- asa asc asd ask asr ass c-- caa cac cad cak car cas cca ccc ccd cck ccr ccs cda cdc cdd cdk cdr cds cka ckc ckd cks cra crc crd crk crr crs csa csc csd csk csr css daa dac dad dak dar das dca dcc dcd dck dcr dcs dda ddc ddd ddk ddr dds dka dkc dkk dkr dks dra drc drd drk drr drs dsa dsc dsd dsk dsr dss ka- kaa kac kad kak kar kas kca kcc kcd kck kcr kcs kda kdc kdk kdr kds kkc kkk kkr kks kra krc krd krk krr krs ksa ksc ksd ksk ksr kss ra- raa rac rad rak rar ras rca rcc rcd rcr rcs rda rdc rdd rdr rds rkc rkk rks rra rrc rrd rrk rrr rrs rsa rsc rsd rsk rsr rss saa sac sad sak sar sas sca scc scd sck scr scs sda sdc sdd sdk sdr sds sk- ska skc skd skk skr sks sr- sra src srd srk srr srs ss- ssa ssc ssd ssk ssr sss