a-a a-c aaa aac aad aae aak ac- aca acc acd ace ack ad- ada adc add ade adk aea aec aed aee aek aka akc akd ake akk c-- caa cac cad cae cak cca ccc ccd cce cck cda cdc cdd cde cdk ce- cea cec ced cee cek cka ckc ckd daa dac dad dae dak dca dcc dcd dce dck dda ddc ddd dde ddk de- dea dec ded dee dek dka dkc dke dkk eaa eac ead eae eak ec- eca ecc ecd ece eck ed- eda edc edd ede edk eea eec eed eee eek eka ekc ekd eke ka- kaa kac kad kae kak kca kcc kcd kce kck kda kdc kde kdk ke- kea kec ked kee kek kkc kke kkk