a-a a-c aaa aac aad aak aao aap ac- aca acc acd ack aco acp ad- ada adc add adk ado adp aka akc akd akk ako akp aoa aoc aod aok aoo aop ap- apa apc apd apk apo app c-- caa cac cad cak cao cap cca ccc ccd cck cco ccp cda cdc cdd cdk cdo cdp cka ckc ckd cko co- coa coc cod cok coo cop cpa cpc cpd cpk cpo cpp daa dac dad dak dao dap dca dcc dcd dck dco dcp dda ddc ddd ddk ddo ddp dka dkc dkk dko dkp doa doc dod dok doo dop dpa dpc dpd dpk dpo dpp ka- kaa kac kad kak kao kap kca kcc kcd kck kcp kda kdc kdk kdo kdp kkc kkk kkp koa koc kod kok koo kop kpa kpc kpd kpk kpo kpp oaa oac oad oak oao oap oc- oca occ ocd ock oco ocp oda odc odd odo odp oka okc okd okk oko okp oo- ooa ooc ood ook ooo oop op- opa opc opd opk opo opp p-p paa pac pad pak pao pap pca pcc pcd pck pco pcp pda pdc pdd pdk pdo pdp pka pkc pkd pko pkp poa poc pod pok poo pop ppa ppc ppd ppk ppo ppp