a-a a-c aaa aac aao aap aas aay ac- aca acc aco acp acs acy aoa aoc aoo aop aos ap- apa apc apo app aps apy as- asa asc aso asp ass asy ay- aya ayc ayo ayp ays c-- caa cac cao cap cas cay cca ccc cco ccp ccs co- coa coc coo cop cos coy cpa cpc cpo cpp cps csa csc cso csp css csy cya cyc cyo cyp cys oaa oac oao oap oas oc- oca occ oco ocp ocs oo- ooa ooc ooo oop oos op- opa opc opo opp ops opy os- osa osc oso osp oss oya oyo oys p-p paa pac pao pap pas pay pca pcc pco pcp pcs poa poc poo pop pos poy ppa ppc ppo ppp pps ps- psa psc pso psp pss psy py- pya pyc pyo pys saa sac sao sap sas say sca scc sco scp scs soa soc soo sop sos soy spa spc spo spp sps spy ss- ssa ssc sso ssp sss sy- sya syc syp sys yaa yac yao yap yas yay yca ycc yco ycp ycs ycy yoc yoo yop yos yoy ypa ypo yps ysa ysc yso ysp yss ysy yyc yys yyy