a-a a-c aaa aac aad aak aao aar aas ac- aca acc acd ack aco acr acs ad- ada adc add adk ado adr ads aka akc akd akk ako akr aks aoa aoc aod aok aoo aor aos ar- ara arc ard ark aro arr ars as- asa asc asd ask aso asr ass c-- caa cac cad cak cao car cas cca ccc ccd cck cco ccr ccs cda cdc cdd cdk cdo cdr cds cka ckc ckd cko cks co- coa coc cod cok coo cor cos cra crc crd crk cro crr crs csa csc csd csk cso csr css daa dac dad dak dao dar das dca dcc dcd dck dco dcr dcs dda ddc ddd ddk ddo ddr dds dka dkc dkk dko dkr dks doa doc dod dok doo dor dos dra drc drd drk dro drr drs dsa dsc dsd dsk dso dsr dss ka- kaa kac kad kak kao kar kas kca kcc kcd kck kcr kcs kda kdc kdk kdo kdr kds kkc kkk kkr kks koa koc kod kok koo kor kos kra krc krd krk kro krr krs ksa ksc ksd ksk kso ksr kss oaa oac oad oak oao oar oas oc- oca occ ocd ock oco ocr ocs oda odc odd odo odr ods oka okc okd okk oko okr oks oo- ooa ooc ood ook ooo oor oos or- ora orc ord ork oro orr ors os- osa osc osd osk oso osr oss ra- raa rac rad rak rao rar ras rca rcc rcd rco rcr rcs rda rdc rdd rdo rdr rds rkc rkk rko rks roa roc rod rok roo ror ros rra rrc rrd rrk rrr rrs rsa rsc rsd rsk rso rsr rss saa sac sad sak sao sar sas sca scc scd sck sco scr scs sda sdc sdd sdk sdo sdr sds sk- ska skc skd skk sko skr sks soa soc sod sok soo sor sos sr- sra src srd srk sro srr srs ss- ssa ssc ssd ssk sso ssr sss