a-a a-c aaa aac aad aah aak aao ac- aca acc acd ach ack aco ad- ada adc add adh adk ado aha ahc ahd ahh ahk aho aka akc akd akh akk ako aoa aoc aod aoh aok aoo c-- caa cac cad cah cak cao cca ccc ccd cch cck cco cda cdc cdd cdh cdk cdo ch- cha chc chd chh chk cho cka ckc ckd ckh cko co- coa coc cod coh cok coo daa dac dad dah dak dao dca dcc dcd dck dco dda ddc ddd ddh ddk ddo dh- dha dhc dhd dhh dhk dho dka dkc dkk dko doa doc dod doh dok doo haa hac had hah hak hao hca hcc hcd hch hck hco hda hdc hdd hdh hdk hdo hha hhc hhd hhh hhk hho hka hkd hkh hkk hko hoa hoc hod hoh hok hoo ka- kaa kac kad kah kak kao kca kcc kcd kch kck kda kdc kdh kdk kdo kha khh khk kho kkc kkh kkk koa koc kod koh kok koo oaa oac oad oah oak oao oc- oca occ ocd och ock oco oda odc odd odh odo oha ohc ohd ohh oho oka okc okd okk oko oo- ooa ooc ood ooh ook ooo