a-a a-c aaa aac aad aae aak aao ac- aca acc acd ace ack aco ad- ada adc add ade adk ado aea aec aed aee aek aeo aka akc akd ake akk ako aoa aoc aod aoe aok aoo c-- caa cac cad cae cak cao cca ccc ccd cce cck cco cda cdc cdd cde cdk cdo ce- cea cec ced cee cek ceo cka ckc ckd cko co- coa coc cod coe cok coo daa dac dad dae dak dao dca dcc dcd dce dck dco dda ddc ddd dde ddk ddo de- dea dec ded dee dek deo dka dkc dke dkk dko doa doc dod doe dok doo eaa eac ead eae eak eao ec- eca ecc ecd ece eck eco ed- eda edc edd ede edk edo eea eec eed eee eek eeo eka ekc ekd eke eko eo- eoa eoc eod eoe eok eoo ka- kaa kac kad kae kak kao kca kcc kcd kce kck kda kdc kde kdk kdo ke- kea kec ked kee kek keo kkc kke kkk koa koc kod koe kok koo oaa oac oad oae oak oao oc- oca occ ocd ock oco oda odc odd ode odo oea oec oed oee oeo oka okc okd oke okk oko oo- ooa ooc ood ook ooo