a-a a-c a-t aaa aac aad aak aat ac- aca acc acd ack act ad- ada adc add adk adt aka akc akd akk at- ata atc atd att c-- caa cac cad cak cat cca ccc ccd cck cct cda cdc cdd cdk cdt cka ckc ckd ckt cta ctc ctd ctk ctt daa dac dad dak dat dca dcc dcd dck dct dda ddc ddd ddk ddt dka dkc dkk dkt dta dtc dtd dtk dtt k-t ka- kaa kac kad kak kat kca kcc kcd kck kct kda kdc kdk kdt kkc kkk kkt kta ktc ktk ktt taa tac tad tak tat tca tcc tcd tck tct tda tdc tdd tdk tdt tka tkc tkk tkt tta ttc ttd ttk ttt