a-a a-c aaa aac aad aak aan aao ac- aca acc acd ack acn aco ad- ada adc add adk adn ado aka akc akd akk akn ako an- ana anc and ank ann ano aoa aoc aod aok aon aoo c-- caa cac cad cak can cao cca ccc ccd cck ccn cco cda cdc cdd cdk cdn cdo cka ckc ckd cko cn- cna cnc cnd cnn cno co- coa coc cod cok con coo daa dac dad dak dan dao dca dcc dcd dck dcn dco dda ddc ddd ddk ddn ddo dka dkc dkk dko dna dnc dnd dnk dnn dno doa doc dod dok don doo ka- kaa kac kad kak kan kao kca kcc kcd kck kcn kda kdc kdk kdo kkc kkk kkn kn- kna knc knd knk knn kno koa koc kod kok kon koo naa nac nad nak nan nao nca ncc ncd nck ncn nco nda ndc ndd ndk ndn ndo nka nkc nkk nkn nko nna nnc nnk nnn nno no- noa noc nod nok non noo oaa oac oad oak oan oao oc- oca occ ocd ock ocn oco oda odc odd odn odo oka okc okd okk oko on- ona onc ond onk onn ono oo- ooa ooc ood ook oon ooo