a-a a-c aaa aac aak aao aap aay ac- aca acc ack aco acp acy aka akc akk ako akp aoa aoc aok aoo aop ap- apa apc apk apo app apy ay- aya ayc ayk ayo ayp c-- caa cac cak cao cap cay cca ccc cck cco ccp cka ckc cko cky co- coa coc cok coo cop coy cpa cpc cpk cpo cpp cya cyc cyk cyo cyp ka- kaa kac kak kao kap kay kca kcc kck kcp kkc kkk kkp kky koa koc kok koo kop koy kpa kpc kpk kpo kpp kya kyc kyo kyp oaa oac oak oao oap oc- oca occ ock oco ocp oka okc okk oko okp oo- ooa ooc ook ooo oop op- opa opc opk opo opp opy oya oyo p-p paa pac pak pao pap pay pca pcc pck pco pcp pka pkc pko pkp pky poa poc pok poo pop poy ppa ppc ppk ppo ppp py- pya pyc pyk pyo yaa yac yak yao yap yay yca ycc yco ycp ycy yka ykk yoc yok yoo yop yoy ypa ypo yyc yyy