a-a a-c aaa aac aah aak aao aar aas ac- aca acc ach ack aco acr acs aha ahc ahh ahk aho ahr ahs aka akc akh akk ako akr aks aoa aoc aoh aok aoo aor aos ar- ara arc arh ark aro arr ars as- asa asc ash ask aso asr ass c-- caa cac cah cak cao car cas cca ccc cch cck cco ccr ccs ch- cha chc chh chk cho chr chs cka ckc ckh cko cks co- coa coc coh cok coo cor cos cra crc crh crk cro crr crs csa csc csh csk cso csr css haa hac hah hak hao har has hca hcc hch hck hco hcr hcs hha hhc hhh hhk hho hhr hhs hka hkh hkk hko hkr hks hoa hoc hoh hok hoo hor hos hr- hra hrc hrh hrk hro hrr hrs hsa hsc hsh hsk hsr hss ka- kaa kac kah kak kao kar kas kca kcc kch kck kcr kcs kha khh khk kho khr khs kkc kkh kkk kkr kks koa koc koh kok koo kor kos kra krc krk kro krr krs ksa ksc ksh ksk kso ksr kss oaa oac oah oak oao oar oas oc- oca occ och ock oco ocr ocs oha ohc ohh oho ohr ohs oka okc okk oko okr oks oo- ooa ooc ooh ook ooo oor oos or- ora orc orh ork oro orr ors os- osa osc osh osk oso osr oss ra- raa rac rah rak rao rar ras rca rcc rch rco rcr rcs rh- rha rhc rhh rho rhr rhs rkc rkk rko rks roa roc roh rok roo ror ros rra rrc rrh rrk rrr rrs rsa rsc rsh rsk rso rsr rss saa sac sah sak sao sar sas sca scc sch sck sco scr scs sh- sha shc shh shk sho shr shs sk- ska skc skh skk sko skr sks soa soc soh sok soo sor sos sr- sra src srh srk sro srr srs ss- ssa ssc ssh ssk sso ssr sss