a-a a-c aaa aac aak aao aay ac- aca acc ack aco acy aka akc akk ako aoa aoc aok aoo ay- aya ayc ayk ayo c-- caa cac cak cao cay cca ccc cck cco cka ckc cko cky co- coa coc cok coo coy cya cyc cyk cyo ka- kaa kac kak kao kay kca kcc kck kkc kkk kky koa koc kok koo koy kya kyc kyo oaa oac oak oao oc- oca occ ock oco oka okc okk oko oo- ooa ooc ook ooo oya oyo yaa yac yak yao yay yca ycc yco ycy yka ykk yoc yok yoo yoy yyc yyy