a-a a-c aaa aac aao aap aay ac- aca acc aco acp acy aoa aoc aoo aop ap- apa apc apo app apy ay- aya ayc ayo ayp c-- caa cac cao cap cay cca ccc cco ccp co- coa coc coo cop coy cpa cpc cpo cpp cya cyc cyo cyp oaa oac oao oap oc- oca occ oco ocp oo- ooa ooc ooo oop op- opa opc opo opp opy oya oyo p-p paa pac pao pap pay pca pcc pco pcp poa poc poo pop poy ppa ppc ppo ppp py- pya pyc pyo yaa yac yao yap yay yca ycc yco ycp ycy yoc yoo yop yoy ypa ypo yyc yyy