a-a a-c aaa aac aad aak aar ac- aca acc acd ack acr ad- ada adc add adk adr aka akc akd akk akr ar- ara arc ard ark arr c-- caa cac cad cak car cca ccc ccd cck ccr cda cdc cdd cdk cdr cka ckc ckd cra crc crd crk crr daa dac dad dak dar dca dcc dcd dck dcr dda ddc ddd ddk ddr dka dkc dkk dkr dra drc drd drk drr ka- kaa kac kad kak kar kca kcc kcd kck kcr kda kdc kdk kdr kkc kkk kkr kra krc krd krk krr ra- raa rac rad rak rar rca rcc rcd rcr rda rdc rdd rdr rkc rkk rra rrc rrd rrk rrr