a-a a-c aaa aac aah aak aao aas ac- aca acc ach ack aco acs aha ahc ahh ahk aho ahs aka akc akh akk ako aks aoa aoc aoh aok aoo aos as- asa asc ash ask aso ass c-- caa cac cah cak cao cas cca ccc cch cck cco ccs ch- cha chc chh chk cho chs cka ckc ckh cko cks co- coa coc coh cok coo cos csa csc csh csk cso css haa hac hah hak hao has hca hcc hch hck hco hcs hha hhc hhh hhk hho hhs hka hkh hkk hko hks hoa hoc hoh hok hoo hos hsa hsc hsh hsk hss ka- kaa kac kah kak kao kas kca kcc kch kck kcs kha khh khk kho khs kkc kkh kkk kks koa koc koh kok koo kos ksa ksc ksh ksk kso kss oaa oac oah oak oao oas oc- oca occ och ock oco ocs oha ohc ohh oho ohs oka okc okk oko oks oo- ooa ooc ooh ook ooo oos os- osa osc osh osk oso oss saa sac sah sak sao sas sca scc sch sck sco scs sh- sha shc shh shk sho shs sk- ska skc skh skk sko sks soa soc soh sok soo sos ss- ssa ssc ssh ssk sso sss