a-a a-c aaa aac aad aah aak ac- aca acc acd ach ack ad- ada adc add adh adk aha ahc ahd ahh ahk aka akc akd akh akk c-- caa cac cad cah cak cca ccc ccd cch cck cda cdc cdd cdh cdk ch- cha chc chd chh chk cka ckc ckd ckh daa dac dad dah dak dca dcc dcd dck dda ddc ddd ddh ddk dh- dha dhc dhd dhh dhk dka dkc dkk haa hac had hah hak hca hcc hcd hch hck hda hdc hdd hdh hdk hha hhc hhd hhh hhk hka hkd hkh hkk ka- kaa kac kad kah kak kca kcc kcd kch kck kda kdc kdh kdk kha khh khk kkc kkh kkk